{
  "complexity_1": {
    "sentences": [
      {
        "id": "complexity_1_sentence_1",
        "sentence": "The train that the airplane whistled at taxied.",
        "structure": [
          {
            "subject": "train",
            "action": "taxied",
            "object": null
          },
          {
            "subject": "airplane",
            "action": "whistled at",
            "object": "train"
          }
        ],
        "middle_entity": "train",
        "all_entities": [
          "airplane",
          "train"
        ],
        "questions_by_entity": {
          "airplane": [
            {
              "question": "What did the airplane do?",
              "answer": "whistle at the train",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the airplane?",
              "answer": "the train",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the airplane do?",
              "answer": "taxied",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the airplane's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the airplane's involvement?",
              "answer": "the train taxied",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            }
          ],
          "train": [
            {
              "question": "What did the train do?",
              "answer": "taxi",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": true
            },
            {
              "question": "What whistled at the train?",
              "answer": "the airplane",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was whistled at do?",
              "answer": "taxied",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the train's action?",
              "answer": "the airplane whistling at the train",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the train's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 12
      },
      {
        "id": "complexity_1_sentence_2",
        "sentence": "The waiter that the mailman seated delivered mail.",
        "structure": [
          {
            "subject": "waiter",
            "action": "delivered mail",
            "object": null
          },
          {
            "subject": "mailman",
            "action": "seated",
            "object": "waiter"
          }
        ],
        "middle_entity": "waiter",
        "all_entities": [
          "mailman",
          "waiter"
        ],
        "questions_by_entity": {
          "mailman": [
            {
              "question": "What did the mailman do?",
              "answer": "seat the waiter",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "Who was affected by the mailman?",
              "answer": "the waiter",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the mailman do?",
              "answer": "delivered mail",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the mailman's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the mailman's involvement?",
              "answer": "the waiter delivered mail",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "mailman",
              "is_middle_entity": false
            }
          ],
          "waiter": [
            {
              "question": "What did the waiter do?",
              "answer": "deliver mail",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "waiter",
              "is_middle_entity": true
            },
            {
              "question": "Who seated the waiter?",
              "answer": "the mailman",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "waiter",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "waiter",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was seated do?",
              "answer": "delivered mail",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "waiter",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the waiter's action?",
              "answer": "the mailman seating the waiter",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "waiter",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the waiter's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "waiter",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 12
      },
      {
        "id": "complexity_1_sentence_3",
        "sentence": "The teacher that the surgeon assigned homework to sutured.",
        "structure": [
          {
            "subject": "teacher",
            "action": "sutured",
            "object": null
          },
          {
            "subject": "surgeon",
            "action": "assigned homework to",
            "object": "teacher"
          }
        ],
        "middle_entity": "teacher",
        "all_entities": [
          "surgeon",
          "teacher"
        ],
        "questions_by_entity": {
          "surgeon": [
            {
              "question": "What did the surgeon do?",
              "answer": "assign homework to the teacher",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "Who was affected by the surgeon?",
              "answer": "the teacher",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the surgeon do?",
              "answer": "sutured",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the surgeon's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the surgeon's involvement?",
              "answer": "the teacher sutured",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "surgeon",
              "is_middle_entity": false
            }
          ],
          "teacher": [
            {
              "question": "What did the teacher do?",
              "answer": "suture",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "teacher",
              "is_middle_entity": true
            },
            {
              "question": "Who assigned homework to the teacher?",
              "answer": "the surgeon",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "teacher",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "teacher",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was assigned homework do?",
              "answer": "sutured",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "teacher",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the teacher's action?",
              "answer": "the surgeon assigning homework to the teacher",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "teacher",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the teacher's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "teacher",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 12
      },
      {
        "id": "complexity_1_sentence_4",
        "sentence": "The lawyer that the doctor cross-examined diagnosed.",
        "structure": [
          {
            "subject": "lawyer",
            "action": "diagnosed",
            "object": null
          },
          {
            "subject": "doctor",
            "action": "cross-examined",
            "object": "lawyer"
          }
        ],
        "middle_entity": "lawyer",
        "all_entities": [
          "lawyer",
          "doctor"
        ],
        "questions_by_entity": {
          "lawyer": [
            {
              "question": "What did the lawyer do?",
              "answer": "diagnose",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "lawyer",
              "is_middle_entity": true
            },
            {
              "question": "Who cross-examined the lawyer?",
              "answer": "the doctor",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "lawyer",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "lawyer",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was cross-examined do?",
              "answer": "diagnosed",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "lawyer",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the lawyer's action?",
              "answer": "the doctor cross-examining the lawyer",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "lawyer",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the lawyer's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "lawyer",
              "is_middle_entity": true
            }
          ],
          "doctor": [
            {
              "question": "What did the doctor do?",
              "answer": "cross-examine the lawyer",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "doctor",
              "is_middle_entity": false
            },
            {
              "question": "Who was affected by the doctor?",
              "answer": "the lawyer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "doctor",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "doctor",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the doctor do?",
              "answer": "diagnosed",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "doctor",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the doctor's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "doctor",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the doctor's involvement?",
              "answer": "the lawyer diagnosed",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "doctor",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 12
      },
      {
        "id": "complexity_1_sentence_5",
        "sentence": "The truck that the boat towed anchored.",
        "structure": [
          {
            "subject": "truck",
            "action": "anchored",
            "object": null
          },
          {
            "subject": "boat",
            "action": "towed",
            "object": "truck"
          }
        ],
        "middle_entity": "truck",
        "all_entities": [
          "boat",
          "truck"
        ],
        "questions_by_entity": {
          "boat": [
            {
              "question": "What did the boat do?",
              "answer": "tow the truck",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the boat?",
              "answer": "the truck",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the boat do?",
              "answer": "anchored",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the boat's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the boat's involvement?",
              "answer": "the truck anchored",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            }
          ],
          "truck": [
            {
              "question": "What did the truck do?",
              "answer": "anchor",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": true
            },
            {
              "question": "What towed the truck?",
              "answer": "the boat",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was towed do?",
              "answer": "anchored",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the truck's action?",
              "answer": "the boat towing the truck",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the truck's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 12
      },
      {
        "id": "complexity_1_sentence_6",
        "sentence": "The firefighter that the nurse rescued nursed.",
        "structure": [
          {
            "subject": "firefighter",
            "action": "nursed",
            "object": null
          },
          {
            "subject": "nurse",
            "action": "rescued",
            "object": "firefighter"
          }
        ],
        "middle_entity": "firefighter",
        "all_entities": [
          "nurse",
          "firefighter"
        ],
        "questions_by_entity": {
          "nurse": [
            {
              "question": "What did the nurse do?",
              "answer": "rescue the firefighter",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "Who was affected by the nurse?",
              "answer": "the firefighter",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the nurse do?",
              "answer": "nursed",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the nurse's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the nurse's involvement?",
              "answer": "the firefighter nursed",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "nurse",
              "is_middle_entity": false
            }
          ],
          "firefighter": [
            {
              "question": "What did the firefighter do?",
              "answer": "nurse",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "firefighter",
              "is_middle_entity": true
            },
            {
              "question": "Who rescued the firefighter?",
              "answer": "the nurse",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "firefighter",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "firefighter",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was rescued do?",
              "answer": "nursed",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "firefighter",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the firefighter's action?",
              "answer": "the nurse rescuing the firefighter",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "firefighter",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the firefighter's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "firefighter",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 12
      },
      {
        "id": "complexity_1_sentence_7",
        "sentence": "The teacher that the principal assigned homework to toured the school.",
        "structure": [
          {
            "subject": "teacher",
            "action": "toured the school",
            "object": null
          },
          {
            "subject": "principal",
            "action": "assigned homework to",
            "object": "teacher"
          }
        ],
        "middle_entity": "teacher",
        "all_entities": [
          "principal",
          "teacher"
        ],
        "questions_by_entity": {
          "principal": [
            {
              "question": "What did the principal do?",
              "answer": "assign homework to the teacher",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "Who was affected by the principal?",
              "answer": "the teacher",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the principal do?",
              "answer": "toured the school",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the principal's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the principal's involvement?",
              "answer": "the teacher toured the school",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "principal",
              "is_middle_entity": false
            }
          ],
          "teacher": [
            {
              "question": "What did the teacher do?",
              "answer": "tour the school",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "teacher",
              "is_middle_entity": true
            },
            {
              "question": "Who assigned homework to the teacher?",
              "answer": "the principal",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "teacher",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "teacher",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was assigned homework do?",
              "answer": "toured the school",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "teacher",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the teacher's action?",
              "answer": "the principal assigning homework to the teacher",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "teacher",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the teacher's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "teacher",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 12
      },
      {
        "id": "complexity_1_sentence_8",
        "sentence": "The waiter that the doctor took food orders from diagnosed.",
        "structure": [
          {
            "subject": "waiter",
            "action": "diagnosed",
            "object": null
          },
          {
            "subject": "doctor",
            "action": "took food orders from",
            "object": "waiter"
          }
        ],
        "middle_entity": "waiter",
        "all_entities": [
          "waiter",
          "doctor"
        ],
        "questions_by_entity": {
          "waiter": [
            {
              "question": "What did the waiter do?",
              "answer": "diagnose",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "waiter",
              "is_middle_entity": true
            },
            {
              "question": "Who took food orders from the waiter?",
              "answer": "the doctor",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "waiter",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "waiter",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity whose order was taken do?",
              "answer": "diagnosed",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "waiter",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the waiter's action?",
              "answer": "the doctor taking food orders from the waiter",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "waiter",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the waiter's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "waiter",
              "is_middle_entity": true
            }
          ],
          "doctor": [
            {
              "question": "What did the doctor do?",
              "answer": "take food orders from the waiter",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "doctor",
              "is_middle_entity": false
            },
            {
              "question": "Who was affected by the doctor?",
              "answer": "the waiter",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "doctor",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "doctor",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the doctor do?",
              "answer": "diagnosed",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "doctor",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the doctor's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "doctor",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the doctor's involvement?",
              "answer": "the waiter diagnosed",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "doctor",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 12
      },
      {
        "id": "complexity_1_sentence_9",
        "sentence": "The starfish that the vulture crawled toward scavenged.",
        "structure": [
          {
            "subject": "starfish",
            "action": "scavenged",
            "object": null
          },
          {
            "subject": "vulture",
            "action": "crawled toward",
            "object": "starfish"
          }
        ],
        "middle_entity": "starfish",
        "all_entities": [
          "starfish",
          "vulture"
        ],
        "questions_by_entity": {
          "starfish": [
            {
              "question": "What did the starfish do?",
              "answer": "scavenge",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "starfish",
              "is_middle_entity": true
            },
            {
              "question": "What crawled toward the starfish?",
              "answer": "the vulture",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "starfish",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "starfish",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was crawled toward do?",
              "answer": "scavenged",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "starfish",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the starfish's action?",
              "answer": "the vulture crawling toward the starfish",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "starfish",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the starfish's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "starfish",
              "is_middle_entity": true
            }
          ],
          "vulture": [
            {
              "question": "What did the vulture do?",
              "answer": "crawl toward the starfish",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "vulture",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the vulture?",
              "answer": "the starfish",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "vulture",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "vulture",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the vulture do?",
              "answer": "scavenged",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "vulture",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the vulture's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "vulture",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the vulture's involvement?",
              "answer": "the starfish scavenged",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "vulture",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 12
      },
      {
        "id": "complexity_1_sentence_10",
        "sentence": "The giraffe that the sheep stretched toward baaed.",
        "structure": [
          {
            "subject": "giraffe",
            "action": "baaed",
            "object": null
          },
          {
            "subject": "sheep",
            "action": "stretched toward",
            "object": "giraffe"
          }
        ],
        "middle_entity": "giraffe",
        "all_entities": [
          "sheep",
          "giraffe"
        ],
        "questions_by_entity": {
          "sheep": [
            {
              "question": "What did the sheep do?",
              "answer": "stretch toward the giraffe",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "sheep",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the sheep?",
              "answer": "the giraffe",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "sheep",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "sheep",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the sheep do?",
              "answer": "baaed",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "sheep",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the sheep's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "sheep",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the sheep's involvement?",
              "answer": "the giraffe baaed",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "sheep",
              "is_middle_entity": false
            }
          ],
          "giraffe": [
            {
              "question": "What did the giraffe do?",
              "answer": "baa",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "giraffe",
              "is_middle_entity": true
            },
            {
              "question": "What stretched toward the giraffe?",
              "answer": "the sheep",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "giraffe",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "giraffe",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was stretched toward do?",
              "answer": "baaed",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "giraffe",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the giraffe's action?",
              "answer": "the sheep stretching toward the giraffe",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "giraffe",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the giraffe's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "giraffe",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 12
      },
      {
        "id": "complexity_1_sentence_11",
        "sentence": "The principal that the judge disciplined gaveled.",
        "structure": [
          {
            "subject": "principal",
            "action": "gaveled",
            "object": null
          },
          {
            "subject": "judge",
            "action": "disciplined",
            "object": "principal"
          }
        ],
        "middle_entity": "principal",
        "all_entities": [
          "principal",
          "judge"
        ],
        "questions_by_entity": {
          "principal": [
            {
              "question": "What did the principal do?",
              "answer": "gavel",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "principal",
              "is_middle_entity": true
            },
            {
              "question": "Who disciplined the principal?",
              "answer": "the judge",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "principal",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "principal",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was disciplined do?",
              "answer": "gaveled",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "principal",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the principal's action?",
              "answer": "the judge disciplining the principal",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "principal",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the principal's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "principal",
              "is_middle_entity": true
            }
          ],
          "judge": [
            {
              "question": "What did the judge do?",
              "answer": "discipline the principal",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "Who was affected by the judge?",
              "answer": "the principal",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the judge do?",
              "answer": "gaveled",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the judge's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the judge's involvement?",
              "answer": "the principal gaveled",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "judge",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 12
      },
      {
        "id": "complexity_1_sentence_12",
        "sentence": "The horse that the elephant neighed at trumpeted.",
        "structure": [
          {
            "subject": "horse",
            "action": "trumpeted",
            "object": null
          },
          {
            "subject": "elephant",
            "action": "neighed at",
            "object": "horse"
          }
        ],
        "middle_entity": "horse",
        "all_entities": [
          "elephant",
          "horse"
        ],
        "questions_by_entity": {
          "elephant": [
            {
              "question": "What did the elephant do?",
              "answer": "neigh at the horse",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "elephant",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the elephant?",
              "answer": "the horse",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "elephant",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "elephant",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the elephant do?",
              "answer": "trumpeted",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "elephant",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the elephant's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "elephant",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the elephant's involvement?",
              "answer": "the horse trumpeted",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "elephant",
              "is_middle_entity": false
            }
          ],
          "horse": [
            {
              "question": "What did the horse do?",
              "answer": "trumpet",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "horse",
              "is_middle_entity": true
            },
            {
              "question": "What neighed at the horse?",
              "answer": "the elephant",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "horse",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "horse",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was neighed at do?",
              "answer": "trumpeted",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "horse",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the horse's action?",
              "answer": "the elephant neighing at the horse",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "horse",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the horse's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "horse",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 12
      },
      {
        "id": "complexity_1_sentence_13",
        "sentence": "The lawyer that the principal cross-examined toured the school.",
        "structure": [
          {
            "subject": "lawyer",
            "action": "toured the school",
            "object": null
          },
          {
            "subject": "principal",
            "action": "cross-examined",
            "object": "lawyer"
          }
        ],
        "middle_entity": "lawyer",
        "all_entities": [
          "principal",
          "lawyer"
        ],
        "questions_by_entity": {
          "principal": [
            {
              "question": "What did the principal do?",
              "answer": "cross-examine the lawyer",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "Who was affected by the principal?",
              "answer": "the lawyer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the principal do?",
              "answer": "toured the school",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the principal's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the principal's involvement?",
              "answer": "the lawyer toured the school",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "principal",
              "is_middle_entity": false
            }
          ],
          "lawyer": [
            {
              "question": "What did the lawyer do?",
              "answer": "tour the school",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "lawyer",
              "is_middle_entity": true
            },
            {
              "question": "Who cross-examined the lawyer?",
              "answer": "the principal",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "lawyer",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "lawyer",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was cross-examined do?",
              "answer": "toured the school",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "lawyer",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the lawyer's action?",
              "answer": "the principal cross-examining the lawyer",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "lawyer",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the lawyer's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "lawyer",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 12
      },
      {
        "id": "complexity_1_sentence_14",
        "sentence": "The coyote that the lizard yipped at darted.",
        "structure": [
          {
            "subject": "coyote",
            "action": "darted",
            "object": null
          },
          {
            "subject": "lizard",
            "action": "yipped at",
            "object": "coyote"
          }
        ],
        "middle_entity": "coyote",
        "all_entities": [
          "lizard",
          "coyote"
        ],
        "questions_by_entity": {
          "lizard": [
            {
              "question": "What did the lizard do?",
              "answer": "yip at the coyote",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "lizard",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the lizard?",
              "answer": "the coyote",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "lizard",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "lizard",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the lizard do?",
              "answer": "darted",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "lizard",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the lizard's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "lizard",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the lizard's involvement?",
              "answer": "the coyote darted",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "lizard",
              "is_middle_entity": false
            }
          ],
          "coyote": [
            {
              "question": "What did the coyote do?",
              "answer": "dart",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "coyote",
              "is_middle_entity": true
            },
            {
              "question": "What yipped at the coyote?",
              "answer": "the lizard",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "coyote",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "coyote",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was yipped at do?",
              "answer": "darted",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "coyote",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the coyote's action?",
              "answer": "the lizard yipping at the coyote",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "coyote",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the coyote's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "coyote",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 12
      },
      {
        "id": "complexity_1_sentence_15",
        "sentence": "The principal that the doctor suspended diagnosed.",
        "structure": [
          {
            "subject": "principal",
            "action": "diagnosed",
            "object": null
          },
          {
            "subject": "doctor",
            "action": "suspended",
            "object": "principal"
          }
        ],
        "middle_entity": "principal",
        "all_entities": [
          "principal",
          "doctor"
        ],
        "questions_by_entity": {
          "principal": [
            {
              "question": "What did the principal do?",
              "answer": "diagnose",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "principal",
              "is_middle_entity": true
            },
            {
              "question": "Who suspended the principal?",
              "answer": "the doctor",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "principal",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "principal",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was suspended do?",
              "answer": "diagnosed",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "principal",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the principal's action?",
              "answer": "the doctor suspending the principal",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "principal",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the principal's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "principal",
              "is_middle_entity": true
            }
          ],
          "doctor": [
            {
              "question": "What did the doctor do?",
              "answer": "suspend the principal",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "doctor",
              "is_middle_entity": false
            },
            {
              "question": "Who was affected by the doctor?",
              "answer": "the principal",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "doctor",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "doctor",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the doctor do?",
              "answer": "diagnosed",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "doctor",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the doctor's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "doctor",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the doctor's involvement?",
              "answer": "the principal diagnosed",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "doctor",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 12
      },
      {
        "id": "complexity_1_sentence_16",
        "sentence": "The nurse that the judge took the temperature of gaveled.",
        "structure": [
          {
            "subject": "nurse",
            "action": "gaveled",
            "object": null
          },
          {
            "subject": "judge",
            "action": "took the temperature of",
            "object": "nurse"
          }
        ],
        "middle_entity": "nurse",
        "all_entities": [
          "nurse",
          "judge"
        ],
        "questions_by_entity": {
          "nurse": [
            {
              "question": "What did the nurse do?",
              "answer": "gavel",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "nurse",
              "is_middle_entity": true
            },
            {
              "question": "Who took the temperature of the nurse?",
              "answer": "the judge",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "nurse",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "nurse",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity whose temperature was taken do?",
              "answer": "gaveled",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "nurse",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the nurse's action?",
              "answer": "the judge taking the temperature of the nurse",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "nurse",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the nurse's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "nurse",
              "is_middle_entity": true
            }
          ],
          "judge": [
            {
              "question": "What did the judge do?",
              "answer": "take the temperature of the nurse",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "Who was affected by the judge?",
              "answer": "the nurse",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the judge do?",
              "answer": "gaveled",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the judge's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the judge's involvement?",
              "answer": "the nurse gaveled",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "judge",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 12
      },
      {
        "id": "complexity_1_sentence_17",
        "sentence": "The donkey that the vulture brayed at scavenged.",
        "structure": [
          {
            "subject": "donkey",
            "action": "scavenged",
            "object": null
          },
          {
            "subject": "vulture",
            "action": "brayed at",
            "object": "donkey"
          }
        ],
        "middle_entity": "donkey",
        "all_entities": [
          "donkey",
          "vulture"
        ],
        "questions_by_entity": {
          "donkey": [
            {
              "question": "What did the donkey do?",
              "answer": "scavenge",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "donkey",
              "is_middle_entity": true
            },
            {
              "question": "What brayed at the donkey?",
              "answer": "the vulture",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "donkey",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "donkey",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was brayed at do?",
              "answer": "scavenged",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "donkey",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the donkey's action?",
              "answer": "the vulture braying at the donkey",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "donkey",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the donkey's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "donkey",
              "is_middle_entity": true
            }
          ],
          "vulture": [
            {
              "question": "What did the vulture do?",
              "answer": "bray at the donkey",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "vulture",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the vulture?",
              "answer": "the donkey",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "vulture",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "vulture",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the vulture do?",
              "answer": "scavenged",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "vulture",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the vulture's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "vulture",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the vulture's involvement?",
              "answer": "the donkey scavenged",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "vulture",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 12
      },
      {
        "id": "complexity_1_sentence_18",
        "sentence": "The motorcycle that the boat wheelied at sailed.",
        "structure": [
          {
            "subject": "motorcycle",
            "action": "sailed",
            "object": null
          },
          {
            "subject": "boat",
            "action": "wheelied at",
            "object": "motorcycle"
          }
        ],
        "middle_entity": "motorcycle",
        "all_entities": [
          "boat",
          "motorcycle"
        ],
        "questions_by_entity": {
          "boat": [
            {
              "question": "What did the boat do?",
              "answer": "wheelie at the motorcycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the boat?",
              "answer": "the motorcycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the boat do?",
              "answer": "sailed",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the boat's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the boat's involvement?",
              "answer": "the motorcycle sailed",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            }
          ],
          "motorcycle": [
            {
              "question": "What did the motorcycle do?",
              "answer": "sail",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "Who wheelied at the motorcycle?",
              "answer": "the boat",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was wheelied at do?",
              "answer": "sailed",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the motorcycle's action?",
              "answer": "the boat doing a wheelie at the motorcycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the motorcycle's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 12
      },
      {
        "id": "complexity_1_sentence_19",
        "sentence": "The whale that the mouse spouted at squeaked.",
        "structure": [
          {
            "subject": "whale",
            "action": "squeaked",
            "object": null
          },
          {
            "subject": "mouse",
            "action": "spouted at",
            "object": "whale"
          }
        ],
        "middle_entity": "whale",
        "all_entities": [
          "whale",
          "mouse"
        ],
        "questions_by_entity": {
          "whale": [
            {
              "question": "What did the whale do?",
              "answer": "squeak",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "whale",
              "is_middle_entity": true
            },
            {
              "question": "What spouted at the whale?",
              "answer": "the mouse",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "whale",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "whale",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was spouted at do?",
              "answer": "squeaked",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "whale",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the whale's action?",
              "answer": "the mouse spouting at the whale",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "whale",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the whale's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "whale",
              "is_middle_entity": true
            }
          ],
          "mouse": [
            {
              "question": "What did the mouse do?",
              "answer": "spout at the whale",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "mouse",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the mouse?",
              "answer": "the whale",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "mouse",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "mouse",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the mouse do?",
              "answer": "squeaked",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "mouse",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the mouse's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "mouse",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the mouse's involvement?",
              "answer": "the whale squeaked",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "mouse",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 12
      },
      {
        "id": "complexity_1_sentence_20",
        "sentence": "The photographer that the police officer shot responded to a 911 call.",
        "structure": [
          {
            "subject": "photographer",
            "action": "responded to a 911 call",
            "object": null
          },
          {
            "subject": "police officer",
            "action": "shot",
            "object": "photographer"
          }
        ],
        "middle_entity": "photographer",
        "all_entities": [
          "police officer",
          "photographer"
        ],
        "questions_by_entity": {
          "police officer": [
            {
              "question": "What did the police officer do?",
              "answer": "shoot the photographer",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the police officer?",
              "answer": "the photographer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the police officer do?",
              "answer": "responded to a 911 call",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the police officer's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the police officer's involvement?",
              "answer": "the photographer responded to a 911 call",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "police officer",
              "is_middle_entity": false
            }
          ],
          "photographer": [
            {
              "question": "What did the photographer do?",
              "answer": "respond to a 911 call",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "photographer",
              "is_middle_entity": true
            },
            {
              "question": "Who shot the photographer?",
              "answer": "the police officer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "photographer",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "photographer",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was shot do?",
              "answer": "responded to a 911 call",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "photographer",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the photographer's action?",
              "answer": "the police officer shooting the photographer",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "photographer",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the photographer's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "photographer",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 12
      },
      {
        "id": "complexity_1_sentence_21",
        "sentence": "The pig that the bear snorted at lumbered.",
        "structure": [
          {
            "subject": "pig",
            "action": "lumbered",
            "object": null
          },
          {
            "subject": "bear",
            "action": "snorted at",
            "object": "pig"
          }
        ],
        "middle_entity": "pig",
        "all_entities": [
          "pig",
          "bear"
        ],
        "questions_by_entity": {
          "pig": [
            {
              "question": "What did the pig do?",
              "answer": "lumber",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "pig",
              "is_middle_entity": true
            },
            {
              "question": "What snorted at the pig?",
              "answer": "the bear",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "pig",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "pig",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was snorted at do?",
              "answer": "lumbered",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "pig",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the pig's action?",
              "answer": "the bear snorting at the pig",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "pig",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the pig's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "pig",
              "is_middle_entity": true
            }
          ],
          "bear": [
            {
              "question": "What did the bear do?",
              "answer": "snort at the pig",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "bear",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the bear?",
              "answer": "the pig",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "bear",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "bear",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the bear do?",
              "answer": "lumbered",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "bear",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the bear's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "bear",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the bear's involvement?",
              "answer": "the pig lumbered",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "bear",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 12
      },
      {
        "id": "complexity_1_sentence_22",
        "sentence": "The motorcycle that the train wheelied at steamed.",
        "structure": [
          {
            "subject": "motorcycle",
            "action": "steamed",
            "object": null
          },
          {
            "subject": "train",
            "action": "wheelied at",
            "object": "motorcycle"
          }
        ],
        "middle_entity": "motorcycle",
        "all_entities": [
          "train",
          "motorcycle"
        ],
        "questions_by_entity": {
          "train": [
            {
              "question": "What did the train do?",
              "answer": "wheelie at the motorcycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the train?",
              "answer": "the motorcycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the train do?",
              "answer": "steamed",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the train's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the train's involvement?",
              "answer": "the motorcycle steamed",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            }
          ],
          "motorcycle": [
            {
              "question": "What did the motorcycle do?",
              "answer": "steam",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "Who wheelied at the motorcycle?",
              "answer": "the train",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was wheelied at do?",
              "answer": "steamed",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the motorcycle's action?",
              "answer": "the train doing a wheelie at the motorcycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the motorcycle's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 12
      },
      {
        "id": "complexity_1_sentence_23",
        "sentence": "The frog that the spider croaked at crawled.",
        "structure": [
          {
            "subject": "frog",
            "action": "crawled",
            "object": null
          },
          {
            "subject": "spider",
            "action": "croaked at",
            "object": "frog"
          }
        ],
        "middle_entity": "frog",
        "all_entities": [
          "frog",
          "spider"
        ],
        "questions_by_entity": {
          "frog": [
            {
              "question": "What did the frog do?",
              "answer": "crawl",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "frog",
              "is_middle_entity": true
            },
            {
              "question": "What croaked at the frog?",
              "answer": "the spider",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "frog",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "frog",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was croaked at do?",
              "answer": "crawled",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "frog",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the frog's action?",
              "answer": "the spider croaking at the frog",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "frog",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the frog's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "frog",
              "is_middle_entity": true
            }
          ],
          "spider": [
            {
              "question": "What did the spider do?",
              "answer": "croak at the frog",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "spider",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the spider?",
              "answer": "the frog",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "spider",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "spider",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the spider do?",
              "answer": "crawled",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "spider",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the spider's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "spider",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the spider's involvement?",
              "answer": "the frog crawled",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "spider",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 12
      },
      {
        "id": "complexity_1_sentence_24",
        "sentence": "The teacher that the mailman assigned homework to sorted mail.",
        "structure": [
          {
            "subject": "teacher",
            "action": "sorted mail",
            "object": null
          },
          {
            "subject": "mailman",
            "action": "assigned homework to",
            "object": "teacher"
          }
        ],
        "middle_entity": "teacher",
        "all_entities": [
          "mailman",
          "teacher"
        ],
        "questions_by_entity": {
          "mailman": [
            {
              "question": "What did the mailman do?",
              "answer": "assign homework to the teacher",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "Who was affected by the mailman?",
              "answer": "the teacher",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the mailman do?",
              "answer": "sorted mail",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the mailman's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the mailman's involvement?",
              "answer": "the teacher sorted mail",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "mailman",
              "is_middle_entity": false
            }
          ],
          "teacher": [
            {
              "question": "What did the teacher do?",
              "answer": "sort mail",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "teacher",
              "is_middle_entity": true
            },
            {
              "question": "Who assigned homework to the teacher?",
              "answer": "the mailman",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "teacher",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "teacher",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was assigned homework do?",
              "answer": "sorted mail",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "teacher",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the teacher's action?",
              "answer": "the mailman assigning homework to the teacher",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "teacher",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the teacher's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "teacher",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 12
      },
      {
        "id": "complexity_1_sentence_25",
        "sentence": "The bicycle that the spaceship rang the bell at orbited.",
        "structure": [
          {
            "subject": "bicycle",
            "action": "orbited",
            "object": null
          },
          {
            "subject": "spaceship",
            "action": "rang the bell at",
            "object": "bicycle"
          }
        ],
        "middle_entity": "bicycle",
        "all_entities": [
          "bicycle",
          "spaceship"
        ],
        "questions_by_entity": {
          "bicycle": [
            {
              "question": "What did the bicycle do?",
              "answer": "orbit",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": true
            },
            {
              "question": "What rang the bell at the bicycle?",
              "answer": "the spaceship",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was ringed do?",
              "answer": "orbited",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the bicycle's action?",
              "answer": "the spaceship ringing the bell at the bicycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the bicycle's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": true
            }
          ],
          "spaceship": [
            {
              "question": "What did the spaceship do?",
              "answer": "ring the bell at the bicycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the spaceship?",
              "answer": "the bicycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the spaceship do?",
              "answer": "orbited",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the spaceship's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the spaceship's involvement?",
              "answer": "the bicycle orbited",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 12
      },
      {
        "id": "complexity_1_sentence_26",
        "sentence": "The doctor that the mailman prescribed medicine to sorted mail.",
        "structure": [
          {
            "subject": "doctor",
            "action": "sorted mail",
            "object": null
          },
          {
            "subject": "mailman",
            "action": "prescribed medicine to",
            "object": "doctor"
          }
        ],
        "middle_entity": "doctor",
        "all_entities": [
          "mailman",
          "doctor"
        ],
        "questions_by_entity": {
          "mailman": [
            {
              "question": "What did the mailman do?",
              "answer": "prescribe medicine to the doctor",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "Who was affected by the mailman?",
              "answer": "the doctor",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the mailman do?",
              "answer": "sorted mail",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the mailman's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the mailman's involvement?",
              "answer": "the doctor sorted mail",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "mailman",
              "is_middle_entity": false
            }
          ],
          "doctor": [
            {
              "question": "What did the doctor do?",
              "answer": "sort mail",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "doctor",
              "is_middle_entity": true
            },
            {
              "question": "Who prescribed medicine to the doctor?",
              "answer": "the mailman",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "doctor",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "doctor",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was prescribed medicine to do?",
              "answer": "sorted mail",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "doctor",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the doctor's action?",
              "answer": "the mailman prescribing to the doctor",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "doctor",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the doctor's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "doctor",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 12
      },
      {
        "id": "complexity_1_sentence_27",
        "sentence": "The bee that the lion stung roared.",
        "structure": [
          {
            "subject": "bee",
            "action": "roared",
            "object": null
          },
          {
            "subject": "lion",
            "action": "stung",
            "object": "bee"
          }
        ],
        "middle_entity": "bee",
        "all_entities": [
          "lion",
          "bee"
        ],
        "questions_by_entity": {
          "lion": [
            {
              "question": "What did the lion do?",
              "answer": "sting the bee",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "lion",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the lion?",
              "answer": "the bee",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "lion",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "lion",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the lion do?",
              "answer": "roared",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "lion",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the lion's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "lion",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the lion's involvement?",
              "answer": "the bee roared",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "lion",
              "is_middle_entity": false
            }
          ],
          "bee": [
            {
              "question": "What did the bee do?",
              "answer": "roar",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "bee",
              "is_middle_entity": true
            },
            {
              "question": "What stung the bee?",
              "answer": "the lion",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "bee",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "bee",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was stung do?",
              "answer": "roared",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "bee",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the bee's action?",
              "answer": "the lion stinging the bee",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "bee",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the bee's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "bee",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 12
      },
      {
        "id": "complexity_1_sentence_28",
        "sentence": "The doctor that the judge examined with a stethoscope gaveled.",
        "structure": [
          {
            "subject": "doctor",
            "action": "gaveled",
            "object": null
          },
          {
            "subject": "judge",
            "action": "examined with a stethoscope",
            "object": "doctor"
          }
        ],
        "middle_entity": "doctor",
        "all_entities": [
          "doctor",
          "judge"
        ],
        "questions_by_entity": {
          "doctor": [
            {
              "question": "What did the doctor do?",
              "answer": "gavel",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "doctor",
              "is_middle_entity": true
            },
            {
              "question": "Who examined the doctor with a stethoscope ?",
              "answer": "the judge",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "doctor",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "doctor",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was examined with a stethoscope do?",
              "answer": "gaveled",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "doctor",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the doctor's action?",
              "answer": "the judge examining  the doctor with a stethoscope",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "doctor",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the doctor's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "doctor",
              "is_middle_entity": true
            }
          ],
          "judge": [
            {
              "question": "What did the judge do?",
              "answer": "examine the doctor with a stethoscope",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "Who was affected by the judge?",
              "answer": "the doctor",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the judge do?",
              "answer": "gaveled",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the judge's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the judge's involvement?",
              "answer": "the doctor gaveled",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "judge",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 12
      },
      {
        "id": "complexity_1_sentence_29",
        "sentence": "The ambulance that the boat blared the siren at docked.",
        "structure": [
          {
            "subject": "ambulance",
            "action": "docked",
            "object": null
          },
          {
            "subject": "boat",
            "action": "blared the siren at",
            "object": "ambulance"
          }
        ],
        "middle_entity": "ambulance",
        "all_entities": [
          "ambulance",
          "boat"
        ],
        "questions_by_entity": {
          "ambulance": [
            {
              "question": "What did the ambulance do?",
              "answer": "dock",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": true
            },
            {
              "question": "What blared the siren at the ambulance?",
              "answer": "the boat",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was blared the siren at do?",
              "answer": "docked",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the ambulance's action?",
              "answer": "the boat blaring the siren at the ambulance",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the ambulance's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": true
            }
          ],
          "boat": [
            {
              "question": "What did the boat do?",
              "answer": "siren at the ambulance",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the boat?",
              "answer": "the ambulance",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the boat do?",
              "answer": "docked",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the boat's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the boat's involvement?",
              "answer": "the ambulance docked",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 12
      },
      {
        "id": "complexity_1_sentence_30",
        "sentence": "The boat that the bicycle anchored near pedaled.",
        "structure": [
          {
            "subject": "boat",
            "action": "pedaled",
            "object": null
          },
          {
            "subject": "bicycle",
            "action": "anchored near",
            "object": "boat"
          }
        ],
        "middle_entity": "boat",
        "all_entities": [
          "bicycle",
          "boat"
        ],
        "questions_by_entity": {
          "bicycle": [
            {
              "question": "What did the bicycle do?",
              "answer": "anchor near the boat",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the bicycle?",
              "answer": "the boat",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the bicycle do?",
              "answer": "pedaled",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the bicycle's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the bicycle's involvement?",
              "answer": "the boat pedaled",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": false
            }
          ],
          "boat": [
            {
              "question": "What did the boat do?",
              "answer": "pedal",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": true
            },
            {
              "question": "What anchored near the boat?",
              "answer": "the bicycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "2",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was anchored near do?",
              "answer": "pedaled",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the boat's action?",
              "answer": "the bicycle anchoring near the boat",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the boat's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 12
      }
    ],
    "total_questions": 360,
    "entities_processed": 60,
    "middle_entities_flagged": 30
  },
  "complexity_2": {
    "sentences": [
      {
        "id": "complexity_2_sentence_1",
        "sentence": "The bicycle that the airplane that the train pedaled past whistled at taxied.",
        "structure": [
          {
            "subject": "bicycle",
            "action": "taxied",
            "object": null
          },
          {
            "subject": "airplane",
            "action": "whistled at",
            "object": "bicycle"
          },
          {
            "subject": "train",
            "action": "pedaled past",
            "object": "airplane"
          }
        ],
        "middle_entity": "airplane",
        "all_entities": [
          "airplane",
          "train",
          "bicycle"
        ],
        "questions_by_entity": {
          "airplane": [
            {
              "question": "What did the airplane do?",
              "answer": "whistle at the bicycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": true
            },
            {
              "question": "What pedaled past the airplane?",
              "answer": "the train",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was pedaled past do?",
              "answer": "whistled at the bicycle",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the airplane's action?",
              "answer": "the train pedaling past the airplane",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the airplane's involvement?",
              "answer": "the bicycle taxied",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": true
            }
          ],
          "train": [
            {
              "question": "What did the train do?",
              "answer": "pedal past the airplane",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the train?",
              "answer": "the airplane",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the train do?",
              "answer": "whistled at the bicycle",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the train's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the train's involvement?",
              "answer": "the airplane whistled at the bicycle",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            }
          ],
          "bicycle": [
            {
              "question": "What did the bicycle do?",
              "answer": "taxi",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What whistled at the bicycle?",
              "answer": "the airplane",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was whistled at do?",
              "answer": "taxied",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the bicycle's action?",
              "answer": "the train pedaling past the airplane which led to the airplane whistling at the bicycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the bicycle's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 18
      },
      {
        "id": "complexity_2_sentence_2",
        "sentence": "The elephant that the dolphin that the butterfly trumpeted at fluttered toward clicked.",
        "structure": [
          {
            "subject": "elephant",
            "action": "clicked",
            "object": null
          },
          {
            "subject": "dolphin",
            "action": "fluttered toward",
            "object": "elephant"
          },
          {
            "subject": "butterfly",
            "action": "trumpeted at",
            "object": "dolphin"
          }
        ],
        "middle_entity": "dolphin",
        "all_entities": [
          "elephant",
          "butterfly",
          "dolphin"
        ],
        "questions_by_entity": {
          "elephant": [
            {
              "question": "What did the elephant do?",
              "answer": "click",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "elephant",
              "is_middle_entity": false
            },
            {
              "question": "What fluttered toward the elephant?",
              "answer": "the dolphin",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "elephant",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "elephant",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was fluttered toward do?",
              "answer": "clicked",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "elephant",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the elephant's action?",
              "answer": "the butterfly trumpeting at the dolphin which led to the dolphin fluttering toward the elephant",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "elephant",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the elephant's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "elephant",
              "is_middle_entity": false
            }
          ],
          "butterfly": [
            {
              "question": "What did the butterfly do?",
              "answer": "trumpet at the dolphin",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "butterfly",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the butterfly?",
              "answer": "the dolphin",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "butterfly",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "butterfly",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the butterfly do?",
              "answer": "fluttered toward the elephant",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "butterfly",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the butterfly's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "butterfly",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the butterfly's involvement?",
              "answer": "the dolphin fluttered toward the elephant",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "butterfly",
              "is_middle_entity": false
            }
          ],
          "dolphin": [
            {
              "question": "What did the dolphin do?",
              "answer": "flutter toward the elephant",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "dolphin",
              "is_middle_entity": true
            },
            {
              "question": "What trumpeted at the dolphin?",
              "answer": "the butterfly",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "dolphin",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "dolphin",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was trumpeted at do?",
              "answer": "fluttered toward the elephant",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "dolphin",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the dolphin's action?",
              "answer": "the butterfly trumpeting at the dolphin",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "dolphin",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the dolphin's involvement?",
              "answer": "the elephant clicked",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "dolphin",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 18
      },
      {
        "id": "complexity_2_sentence_3",
        "sentence": "The butterfly that the moose that the donkey fluttered toward kicked bellowed.",
        "structure": [
          {
            "subject": "butterfly",
            "action": "bellowed",
            "object": null
          },
          {
            "subject": "moose",
            "action": "kicked",
            "object": "butterfly"
          },
          {
            "subject": "donkey",
            "action": "fluttered toward",
            "object": "moose"
          }
        ],
        "middle_entity": "moose",
        "all_entities": [
          "donkey",
          "butterfly",
          "moose"
        ],
        "questions_by_entity": {
          "donkey": [
            {
              "question": "What did the donkey do?",
              "answer": "flutter toward the moose",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "donkey",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the donkey?",
              "answer": "the moose",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "donkey",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "donkey",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the donkey do?",
              "answer": "kicked the butterfly",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "donkey",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the donkey's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "donkey",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the donkey's involvement?",
              "answer": "the moose kicked the butterfly",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "donkey",
              "is_middle_entity": false
            }
          ],
          "butterfly": [
            {
              "question": "What did the butterfly do?",
              "answer": "bellow",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "butterfly",
              "is_middle_entity": false
            },
            {
              "question": "What kicked the butterfly?",
              "answer": "the moose",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "butterfly",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "butterfly",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was kicked do?",
              "answer": "bellowed",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "butterfly",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the butterfly's action?",
              "answer": "the donkey fluttering toward the moose which led to the moose kicking the butterfly",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "butterfly",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the butterfly's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "butterfly",
              "is_middle_entity": false
            }
          ],
          "moose": [
            {
              "question": "What did the moose do?",
              "answer": "kick the butterfly",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "moose",
              "is_middle_entity": true
            },
            {
              "question": "What fluttered toward the moose?",
              "answer": "the donkey",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "moose",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "moose",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was fluttered toward do?",
              "answer": "kicked the butterfly",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "moose",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the moose's action?",
              "answer": "the donkey fluttering toward the moose",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "moose",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the moose's involvement?",
              "answer": "the butterfly bellowed",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "moose",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 18
      },
      {
        "id": "complexity_2_sentence_4",
        "sentence": "The butterfly that the rabbit that the seagull fluttered toward dive-bombed hopped.",
        "structure": [
          {
            "subject": "butterfly",
            "action": "hopped",
            "object": null
          },
          {
            "subject": "rabbit",
            "action": "dive-bombed",
            "object": "butterfly"
          },
          {
            "subject": "seagull",
            "action": "fluttered toward",
            "object": "rabbit"
          }
        ],
        "middle_entity": "rabbit",
        "all_entities": [
          "rabbit",
          "butterfly",
          "seagull"
        ],
        "questions_by_entity": {
          "rabbit": [
            {
              "question": "What did the rabbit do?",
              "answer": "dive-bomb the butterfly",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "rabbit",
              "is_middle_entity": true
            },
            {
              "question": "What fluttered toward the rabbit?",
              "answer": "the seagull",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "rabbit",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "rabbit",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was fluttered toward do?",
              "answer": "dive-bombed the butterfly",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "rabbit",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the rabbit's action?",
              "answer": "the seagull fluttering toward the rabbit",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "rabbit",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the rabbit's involvement?",
              "answer": "the butterfly hopped",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "rabbit",
              "is_middle_entity": true
            }
          ],
          "butterfly": [
            {
              "question": "What did the butterfly do?",
              "answer": "hop",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "butterfly",
              "is_middle_entity": false
            },
            {
              "question": "What dive-bombed the butterfly?",
              "answer": "the rabbit",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "butterfly",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "butterfly",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was dive-bombed do?",
              "answer": "hopped",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "butterfly",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the butterfly's action?",
              "answer": "the seagull fluttering toward the rabbit which led to the rabbit dive-bombing the butterfly",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "butterfly",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the butterfly's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "butterfly",
              "is_middle_entity": false
            }
          ],
          "seagull": [
            {
              "question": "What did the seagull do?",
              "answer": "flutter toward the rabbit",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "seagull",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the seagull?",
              "answer": "the rabbit",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "seagull",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "seagull",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the seagull do?",
              "answer": "dive-bombed the butterfly",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "seagull",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the seagull's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "seagull",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the seagull's involvement?",
              "answer": "the rabbit dive-bombed the butterfly",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "seagull",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 18
      },
      {
        "id": "complexity_2_sentence_5",
        "sentence": "The train that the truck that the airplane whistled at strafed jackknifed.",
        "structure": [
          {
            "subject": "train",
            "action": "jackknifed",
            "object": null
          },
          {
            "subject": "truck",
            "action": "strafed",
            "object": "train"
          },
          {
            "subject": "airplane",
            "action": "whistled at",
            "object": "truck"
          }
        ],
        "middle_entity": "truck",
        "all_entities": [
          "airplane",
          "train",
          "truck"
        ],
        "questions_by_entity": {
          "airplane": [
            {
              "question": "What did the airplane do?",
              "answer": "whistle at the truck",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the airplane?",
              "answer": "the truck",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the airplane do?",
              "answer": "strafed the train",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the airplane's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the airplane's involvement?",
              "answer": "the truck strafed the train",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            }
          ],
          "train": [
            {
              "question": "What did the train do?",
              "answer": "jackknife",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What strafed the train?",
              "answer": "the truck",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was strafed do?",
              "answer": "jackknifed",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the train's action?",
              "answer": "the airplane whistling at the truck which led to the truck strafing the train",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the train's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            }
          ],
          "truck": [
            {
              "question": "What did the truck do?",
              "answer": "strafe the train",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": true
            },
            {
              "question": "What whistled at the truck?",
              "answer": "the airplane",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was whistled at do?",
              "answer": "strafed the train",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the truck's action?",
              "answer": "the airplane whistling at the truck",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the truck's involvement?",
              "answer": "the train jackknifed",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 18
      },
      {
        "id": "complexity_2_sentence_6",
        "sentence": "The photographer that the police officer that the judge developed photos of gaveled responded to a 911 call.",
        "structure": [
          {
            "subject": "photographer",
            "action": "responded to a 911 call",
            "object": null
          },
          {
            "subject": "police officer",
            "action": "gaveled",
            "object": "photographer"
          },
          {
            "subject": "judge",
            "action": "developed photos of",
            "object": "police officer"
          }
        ],
        "middle_entity": "police officer",
        "all_entities": [
          "police officer",
          "judge",
          "photographer"
        ],
        "questions_by_entity": {
          "police officer": [
            {
              "question": "What did the police officer do?",
              "answer": "gavel the photographer",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "police officer",
              "is_middle_entity": true
            },
            {
              "question": "Who developed photos of the police officer?",
              "answer": "the judge",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "police officer",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "police officer",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity whose photos were developed do?",
              "answer": "gaveled the photographer",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "police officer",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the police officer's action?",
              "answer": "the judge developing photos of the police officer",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "police officer",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the police officer's involvement?",
              "answer": "the photographer responded to a 911 call",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "police officer",
              "is_middle_entity": true
            }
          ],
          "judge": [
            {
              "question": "What did the judge do?",
              "answer": "develop photos of the police officer",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "Who was affected by the judge?",
              "answer": "the police officer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the judge do?",
              "answer": "gaveled the photographer",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the judge's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the judge's involvement?",
              "answer": "the police officer gaveled the photographer",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "judge",
              "is_middle_entity": false
            }
          ],
          "photographer": [
            {
              "question": "What did the photographer do?",
              "answer": "respond to a 911 call",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "Who gaveled the photographer?",
              "answer": "the police officer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was gaveled do?",
              "answer": "responded to a 911 call",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the photographer's action?",
              "answer": "the judge developing photos of the police officer which led to the police officer gaveling the photographer",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the photographer's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "photographer",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 18
      },
      {
        "id": "complexity_2_sentence_7",
        "sentence": "The mailman that the surgeon that the teacher delivered mail to graded sutured.",
        "structure": [
          {
            "subject": "mailman",
            "action": "sutured",
            "object": null
          },
          {
            "subject": "surgeon",
            "action": "graded",
            "object": "mailman"
          },
          {
            "subject": "teacher",
            "action": "delivered mail to",
            "object": "surgeon"
          }
        ],
        "middle_entity": "surgeon",
        "all_entities": [
          "mailman",
          "surgeon",
          "teacher"
        ],
        "questions_by_entity": {
          "mailman": [
            {
              "question": "What did the mailman do?",
              "answer": "suture",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "Who graded the mailman?",
              "answer": "the surgeon",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was graded do?",
              "answer": "sutured",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the mailman's action?",
              "answer": "the teacher delivering mail to the surgeon which led to the surgeon grading the mailman",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the mailman's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "mailman",
              "is_middle_entity": false
            }
          ],
          "surgeon": [
            {
              "question": "What did the surgeon do?",
              "answer": "grade the mailman",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "surgeon",
              "is_middle_entity": true
            },
            {
              "question": "Who delivered mail to the surgeon?",
              "answer": "the teacher",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "surgeon",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "surgeon",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was delivered mail do?",
              "answer": "graded the mailman",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "surgeon",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the surgeon's action?",
              "answer": "the teacher delivering mail to the surgeon",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "surgeon",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the surgeon's involvement?",
              "answer": "the mailman sutured",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "surgeon",
              "is_middle_entity": true
            }
          ],
          "teacher": [
            {
              "question": "What did the teacher do?",
              "answer": "deliver mail to the surgeon",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "Who was affected by the teacher?",
              "answer": "the surgeon",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the teacher do?",
              "answer": "graded the mailman",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the teacher's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the teacher's involvement?",
              "answer": "the surgeon graded the mailman",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "teacher",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 18
      },
      {
        "id": "complexity_2_sentence_8",
        "sentence": "The airplane that the motorcycle that the bicycle strafed cycled around wheelied.",
        "structure": [
          {
            "subject": "airplane",
            "action": "wheelied",
            "object": null
          },
          {
            "subject": "motorcycle",
            "action": "cycled around",
            "object": "airplane"
          },
          {
            "subject": "bicycle",
            "action": "strafed",
            "object": "motorcycle"
          }
        ],
        "middle_entity": "motorcycle",
        "all_entities": [
          "airplane",
          "bicycle",
          "motorcycle"
        ],
        "questions_by_entity": {
          "airplane": [
            {
              "question": "What did the airplane do?",
              "answer": "wheelie",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What cycled around the airplane?",
              "answer": "the motorcycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was cycled around do?",
              "answer": "wheelied",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the airplane's action?",
              "answer": "the bicycle strafing the motorcycle which led to the motorcycle cycling around the airplane",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the airplane's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            }
          ],
          "bicycle": [
            {
              "question": "What did the bicycle do?",
              "answer": "strafe the motorcycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the bicycle?",
              "answer": "the motorcycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the bicycle do?",
              "answer": "cycled around the airplane",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the bicycle's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the bicycle's involvement?",
              "answer": "the motorcycle cycled around the airplane",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": false
            }
          ],
          "motorcycle": [
            {
              "question": "What did the motorcycle do?",
              "answer": "cycle around the airplane",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "What strafed the motorcycle?",
              "answer": "the bicycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was strafed do?",
              "answer": "cycled around the airplane",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the motorcycle's action?",
              "answer": "the bicycle strafing the motorcycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the motorcycle's involvement?",
              "answer": "the airplane wheelied",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 18
      },
      {
        "id": "complexity_2_sentence_9",
        "sentence": "The train that the motorcycle that the boat whistled at moored to wheelied.",
        "structure": [
          {
            "subject": "train",
            "action": "wheelied",
            "object": null
          },
          {
            "subject": "motorcycle",
            "action": "moored to",
            "object": "train"
          },
          {
            "subject": "boat",
            "action": "whistled at",
            "object": "motorcycle"
          }
        ],
        "middle_entity": "motorcycle",
        "all_entities": [
          "train",
          "boat",
          "motorcycle"
        ],
        "questions_by_entity": {
          "train": [
            {
              "question": "What did the train do?",
              "answer": "wheelie",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What moored to the train?",
              "answer": "the motorcycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was moored to do?",
              "answer": "wheelied",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the train's action?",
              "answer": "the boat whistling at the motorcycle which led to the motorcycle mooring to the train",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the train's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            }
          ],
          "boat": [
            {
              "question": "What did the boat do?",
              "answer": "whistle at the motorcycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the boat?",
              "answer": "the motorcycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the boat do?",
              "answer": "moored to the train",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the boat's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the boat's involvement?",
              "answer": "the motorcycle moored to the train",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            }
          ],
          "motorcycle": [
            {
              "question": "What did the motorcycle do?",
              "answer": "moor to the train",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "What whistled at the motorcycle?",
              "answer": "the boat",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was whistled at do?",
              "answer": "moored to the train",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the motorcycle's action?",
              "answer": "the boat whistling at the motorcycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the motorcycle's involvement?",
              "answer": "the train wheelied",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 18
      },
      {
        "id": "complexity_2_sentence_10",
        "sentence": "The ambulance that the motorcycle that the airplane blared the siren at strafed wheelied.",
        "structure": [
          {
            "subject": "ambulance",
            "action": "wheelied",
            "object": null
          },
          {
            "subject": "motorcycle",
            "action": "strafed",
            "object": "ambulance"
          },
          {
            "subject": "airplane",
            "action": "blared the siren at",
            "object": "motorcycle"
          }
        ],
        "middle_entity": "motorcycle",
        "all_entities": [
          "airplane",
          "ambulance",
          "motorcycle"
        ],
        "questions_by_entity": {
          "airplane": [
            {
              "question": "What did the airplane do?",
              "answer": "siren at the motorcycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the airplane?",
              "answer": "the motorcycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the airplane do?",
              "answer": "strafed the ambulance",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the airplane's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the airplane's involvement?",
              "answer": "the motorcycle strafed the ambulance",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            }
          ],
          "ambulance": [
            {
              "question": "What did the ambulance do?",
              "answer": "wheelie",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What strafed the ambulance?",
              "answer": "the motorcycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was strafed do?",
              "answer": "wheelied",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the ambulance's action?",
              "answer": "the airplane blaring the siren at the motorcycle which led to the motorcycle strafing the ambulance",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the ambulance's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": false
            }
          ],
          "motorcycle": [
            {
              "question": "What did the motorcycle do?",
              "answer": "strafe the ambulance",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "What blared the siren at the motorcycle?",
              "answer": "the airplane",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was blared the siren at do?",
              "answer": "strafed the ambulance",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the motorcycle's action?",
              "answer": "the airplane blaring the siren at the motorcycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the motorcycle's involvement?",
              "answer": "the ambulance wheelied",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 18
      },
      {
        "id": "complexity_2_sentence_11",
        "sentence": "The principal that the photographer that the firefighter suspended rescued photographed.",
        "structure": [
          {
            "subject": "principal",
            "action": "photographed",
            "object": null
          },
          {
            "subject": "photographer",
            "action": "rescued",
            "object": "principal"
          },
          {
            "subject": "firefighter",
            "action": "suspended",
            "object": "photographer"
          }
        ],
        "middle_entity": "photographer",
        "all_entities": [
          "principal",
          "firefighter",
          "photographer"
        ],
        "questions_by_entity": {
          "principal": [
            {
              "question": "What did the principal do?",
              "answer": "photograph",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "Who rescued the principal?",
              "answer": "the photographer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was rescued do?",
              "answer": "photographed",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the principal's action?",
              "answer": "the firefighter suspending the photographer which led to the photographer rescuing the principal",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the principal's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "principal",
              "is_middle_entity": false
            }
          ],
          "firefighter": [
            {
              "question": "What did the firefighter do?",
              "answer": "suspend the photographer",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "Who was affected by the firefighter?",
              "answer": "the photographer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the firefighter do?",
              "answer": "rescued the principal",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the firefighter's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the firefighter's involvement?",
              "answer": "the photographer rescued the principal",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "firefighter",
              "is_middle_entity": false
            }
          ],
          "photographer": [
            {
              "question": "What did the photographer do?",
              "answer": "rescue the principal",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "photographer",
              "is_middle_entity": true
            },
            {
              "question": "Who suspended the photographer?",
              "answer": "the firefighter",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "photographer",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "photographer",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was suspended do?",
              "answer": "rescued the principal",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "photographer",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the photographer's action?",
              "answer": "the firefighter suspending the photographer",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "photographer",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the photographer's involvement?",
              "answer": "the principal photographed",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "photographer",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 18
      },
      {
        "id": "complexity_2_sentence_12",
        "sentence": "The teacher that the police officer that the photographer lectured to photographed responded to a 911 call.",
        "structure": [
          {
            "subject": "teacher",
            "action": "responded to a 911 call",
            "object": null
          },
          {
            "subject": "police officer",
            "action": "photographed",
            "object": "teacher"
          },
          {
            "subject": "photographer",
            "action": "lectured to",
            "object": "police officer"
          }
        ],
        "middle_entity": "police officer",
        "all_entities": [
          "police officer",
          "photographer",
          "teacher"
        ],
        "questions_by_entity": {
          "police officer": [
            {
              "question": "What did the police officer do?",
              "answer": "photograph the teacher",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "police officer",
              "is_middle_entity": true
            },
            {
              "question": "Who lectured to the police officer?",
              "answer": "the photographer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "police officer",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "police officer",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was lectured do?",
              "answer": "photographed the teacher",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "police officer",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the police officer's action?",
              "answer": "the photographer lecturing the police officer",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "police officer",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the police officer's involvement?",
              "answer": "the teacher responded to a 911 call",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "police officer",
              "is_middle_entity": true
            }
          ],
          "photographer": [
            {
              "question": "What did the photographer do?",
              "answer": "lecture to the police officer",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "Who was affected by the photographer?",
              "answer": "the police officer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the photographer do?",
              "answer": "photographed the teacher",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the photographer's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the photographer's involvement?",
              "answer": "the police officer photographed the teacher",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "photographer",
              "is_middle_entity": false
            }
          ],
          "teacher": [
            {
              "question": "What did the teacher do?",
              "answer": "respond to a 911 call",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "Who photographed the teacher?",
              "answer": "the police officer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was photographed do?",
              "answer": "responded to a 911 call",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the teacher's action?",
              "answer": "the photographer lecturing the police officer which led to the police officer photographing the teacher",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the teacher's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "teacher",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 18
      },
      {
        "id": "complexity_2_sentence_13",
        "sentence": "The mailman that the photographer that the waiter delivered mail to served photographed.",
        "structure": [
          {
            "subject": "mailman",
            "action": "photographed",
            "object": null
          },
          {
            "subject": "photographer",
            "action": "served",
            "object": "mailman"
          },
          {
            "subject": "waiter",
            "action": "delivered mail to",
            "object": "photographer"
          }
        ],
        "middle_entity": "photographer",
        "all_entities": [
          "mailman",
          "waiter",
          "photographer"
        ],
        "questions_by_entity": {
          "mailman": [
            {
              "question": "What did the mailman do?",
              "answer": "photograph",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "Who served the mailman?",
              "answer": "the photographer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was served do?",
              "answer": "photographed",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the mailman's action?",
              "answer": "the waiter delivering mail to the photographer which led to the photographer serving the mailman",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the mailman's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "mailman",
              "is_middle_entity": false
            }
          ],
          "waiter": [
            {
              "question": "What did the waiter do?",
              "answer": "deliver mail to the photographer",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "Who was affected by the waiter?",
              "answer": "the photographer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the waiter do?",
              "answer": "served the mailman",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the waiter's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the waiter's involvement?",
              "answer": "the photographer served the mailman",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "waiter",
              "is_middle_entity": false
            }
          ],
          "photographer": [
            {
              "question": "What did the photographer do?",
              "answer": "serve the mailman",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "photographer",
              "is_middle_entity": true
            },
            {
              "question": "Who delivered mail to the photographer?",
              "answer": "the waiter",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "photographer",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "photographer",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was delivered mail do?",
              "answer": "served the mailman",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "photographer",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the photographer's action?",
              "answer": "the waiter delivering mail to the photographer",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "photographer",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the photographer's involvement?",
              "answer": "the mailman photographed",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "photographer",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 18
      },
      {
        "id": "complexity_2_sentence_14",
        "sentence": "The mailman that the waiter that the photographer delivered mail to shot waited tables.",
        "structure": [
          {
            "subject": "mailman",
            "action": "waited tables",
            "object": null
          },
          {
            "subject": "waiter",
            "action": "shot",
            "object": "mailman"
          },
          {
            "subject": "photographer",
            "action": "delivered mail to",
            "object": "waiter"
          }
        ],
        "middle_entity": "waiter",
        "all_entities": [
          "mailman",
          "waiter",
          "photographer"
        ],
        "questions_by_entity": {
          "mailman": [
            {
              "question": "What did the mailman do?",
              "answer": "wait tables",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "Who shot the mailman?",
              "answer": "the waiter",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was shot do?",
              "answer": "waited tables",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the mailman's action?",
              "answer": "the photographer delivering mail to the waiter which led to the waiter shooting the mailman",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the mailman's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "mailman",
              "is_middle_entity": false
            }
          ],
          "waiter": [
            {
              "question": "What did the waiter do?",
              "answer": "shoot the mailman",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "waiter",
              "is_middle_entity": true
            },
            {
              "question": "Who delivered mail to the waiter?",
              "answer": "the photographer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "waiter",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "waiter",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was delivered mail do?",
              "answer": "shot the mailman",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "waiter",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the waiter's action?",
              "answer": "the photographer delivering mail to the waiter",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "waiter",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the waiter's involvement?",
              "answer": "the mailman waited tables",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "waiter",
              "is_middle_entity": true
            }
          ],
          "photographer": [
            {
              "question": "What did the photographer do?",
              "answer": "deliver mail to the waiter",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "Who was affected by the photographer?",
              "answer": "the waiter",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the photographer do?",
              "answer": "shot the mailman",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the photographer's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the photographer's involvement?",
              "answer": "the waiter shot the mailman",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "photographer",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 18
      },
      {
        "id": "complexity_2_sentence_15",
        "sentence": "The ambulance that the train that the spaceship blared the siren at orbited steamed.",
        "structure": [
          {
            "subject": "ambulance",
            "action": "steamed",
            "object": null
          },
          {
            "subject": "train",
            "action": "orbited",
            "object": "ambulance"
          },
          {
            "subject": "spaceship",
            "action": "blared the siren at",
            "object": "train"
          }
        ],
        "middle_entity": "train",
        "all_entities": [
          "train",
          "ambulance",
          "spaceship"
        ],
        "questions_by_entity": {
          "train": [
            {
              "question": "What did the train do?",
              "answer": "orbit the ambulance",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": true
            },
            {
              "question": "What blared the siren at the train?",
              "answer": "the spaceship",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was blared the siren at do?",
              "answer": "orbited the ambulance",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the train's action?",
              "answer": "the spaceship blaring the siren at the train",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the train's involvement?",
              "answer": "the ambulance steamed",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": true
            }
          ],
          "ambulance": [
            {
              "question": "What did the ambulance do?",
              "answer": "steam",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What orbited the ambulance?",
              "answer": "the train",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was orbited do?",
              "answer": "steamed",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the ambulance's action?",
              "answer": "the spaceship blaring the siren at the train which led to the train orbiting the ambulance",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the ambulance's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": false
            }
          ],
          "spaceship": [
            {
              "question": "What did the spaceship do?",
              "answer": "siren at the train",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the spaceship?",
              "answer": "the train",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the spaceship do?",
              "answer": "orbited the ambulance",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the spaceship's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the spaceship's involvement?",
              "answer": "the train orbited the ambulance",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 18
      },
      {
        "id": "complexity_2_sentence_16",
        "sentence": "The deer that the parrot that the frog bounded toward hopped toward chattered.",
        "structure": [
          {
            "subject": "deer",
            "action": "chattered",
            "object": null
          },
          {
            "subject": "parrot",
            "action": "hopped toward",
            "object": "deer"
          },
          {
            "subject": "frog",
            "action": "bounded toward",
            "object": "parrot"
          }
        ],
        "middle_entity": "parrot",
        "all_entities": [
          "parrot",
          "deer",
          "frog"
        ],
        "questions_by_entity": {
          "parrot": [
            {
              "question": "What did the parrot do?",
              "answer": "hop toward the deer",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "parrot",
              "is_middle_entity": true
            },
            {
              "question": "What bounded toward the parrot?",
              "answer": "the frog",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "parrot",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "parrot",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was bounded toward do?",
              "answer": "hopped toward the deer",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "parrot",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the parrot's action?",
              "answer": "the frog bounding toward the parrot",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "parrot",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the parrot's involvement?",
              "answer": "the deer chattered",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "parrot",
              "is_middle_entity": true
            }
          ],
          "deer": [
            {
              "question": "What did the deer do?",
              "answer": "chatter",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "deer",
              "is_middle_entity": false
            },
            {
              "question": "What hopped toward the deer?",
              "answer": "the parrot",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "deer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "deer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was hopped toward do?",
              "answer": "chattered",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "deer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the deer's action?",
              "answer": "the frog bounding toward the parrot which led to the parrot hopping toward the deer",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "deer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the deer's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "deer",
              "is_middle_entity": false
            }
          ],
          "frog": [
            {
              "question": "What did the frog do?",
              "answer": "bound toward the parrot",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "frog",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the frog?",
              "answer": "the parrot",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "frog",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "frog",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the frog do?",
              "answer": "hopped toward the deer",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "frog",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the frog's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "frog",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the frog's involvement?",
              "answer": "the parrot hopped toward the deer",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "frog",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 18
      },
      {
        "id": "complexity_2_sentence_17",
        "sentence": "The airplane that the bicycle that the train strafed whistled at pedaled.",
        "structure": [
          {
            "subject": "airplane",
            "action": "pedaled",
            "object": null
          },
          {
            "subject": "bicycle",
            "action": "whistled at",
            "object": "airplane"
          },
          {
            "subject": "train",
            "action": "strafed",
            "object": "bicycle"
          }
        ],
        "middle_entity": "bicycle",
        "all_entities": [
          "airplane",
          "train",
          "bicycle"
        ],
        "questions_by_entity": {
          "airplane": [
            {
              "question": "What did the airplane do?",
              "answer": "pedal",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What whistled at the airplane?",
              "answer": "the bicycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was whistled at do?",
              "answer": "pedaled",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the airplane's action?",
              "answer": "the train strafing the bicycle which led to the bicycle whistling at the airplane",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the airplane's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            }
          ],
          "train": [
            {
              "question": "What did the train do?",
              "answer": "strafe the bicycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the train?",
              "answer": "the bicycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the train do?",
              "answer": "whistled at the airplane",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the train's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the train's involvement?",
              "answer": "the bicycle whistled at the airplane",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            }
          ],
          "bicycle": [
            {
              "question": "What did the bicycle do?",
              "answer": "whistle at the airplane",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": true
            },
            {
              "question": "What strafed the bicycle?",
              "answer": "the train",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was strafed do?",
              "answer": "whistled at the airplane",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the bicycle's action?",
              "answer": "the train strafing the bicycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the bicycle's involvement?",
              "answer": "the airplane pedaled",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 18
      },
      {
        "id": "complexity_2_sentence_18",
        "sentence": "The lawyer that the nurse that the mailman subpoenaed delivered mail to nursed.",
        "structure": [
          {
            "subject": "lawyer",
            "action": "nursed",
            "object": null
          },
          {
            "subject": "nurse",
            "action": "delivered mail to",
            "object": "lawyer"
          },
          {
            "subject": "mailman",
            "action": "subpoenaed",
            "object": "nurse"
          }
        ],
        "middle_entity": "nurse",
        "all_entities": [
          "nurse",
          "lawyer",
          "mailman"
        ],
        "questions_by_entity": {
          "nurse": [
            {
              "question": "What did the nurse do?",
              "answer": "deliver mail to the lawyer",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "nurse",
              "is_middle_entity": true
            },
            {
              "question": "Who subpoenaed the nurse?",
              "answer": "the mailman",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "nurse",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "nurse",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was subpoenaed do?",
              "answer": "delivered mail to the lawyer",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "nurse",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the nurse's action?",
              "answer": "the mailman subpoenaing the nurse",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "nurse",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the nurse's involvement?",
              "answer": "the lawyer nursed",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "nurse",
              "is_middle_entity": true
            }
          ],
          "lawyer": [
            {
              "question": "What did the lawyer do?",
              "answer": "nurse",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "Who delivered mail to the lawyer?",
              "answer": "the nurse",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was delivered mail do?",
              "answer": "nursed",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the lawyer's action?",
              "answer": "the mailman subpoenaing the nurse which led to the nurse delivering mail to the lawyer",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the lawyer's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "lawyer",
              "is_middle_entity": false
            }
          ],
          "mailman": [
            {
              "question": "What did the mailman do?",
              "answer": "subpoena the nurse",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "Who was affected by the mailman?",
              "answer": "the nurse",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the mailman do?",
              "answer": "delivered mail to the lawyer",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the mailman's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the mailman's involvement?",
              "answer": "the nurse delivered mail to the lawyer",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "mailman",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 18
      },
      {
        "id": "complexity_2_sentence_19",
        "sentence": "The shark that the sheep that the elephant attacked charged at baaed.",
        "structure": [
          {
            "subject": "shark",
            "action": "baaed",
            "object": null
          },
          {
            "subject": "sheep",
            "action": "charged at",
            "object": "shark"
          },
          {
            "subject": "elephant",
            "action": "attacked",
            "object": "sheep"
          }
        ],
        "middle_entity": "sheep",
        "all_entities": [
          "elephant",
          "shark",
          "sheep"
        ],
        "questions_by_entity": {
          "elephant": [
            {
              "question": "What did the elephant do?",
              "answer": "attack the sheep",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "elephant",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the elephant?",
              "answer": "the sheep",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "elephant",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "elephant",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the elephant do?",
              "answer": "charged at the shark",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "elephant",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the elephant's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "elephant",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the elephant's involvement?",
              "answer": "the sheep charged at the shark",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "elephant",
              "is_middle_entity": false
            }
          ],
          "shark": [
            {
              "question": "What did the shark do?",
              "answer": "baa",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "shark",
              "is_middle_entity": false
            },
            {
              "question": "What charged at the shark?",
              "answer": "the sheep",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "shark",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "shark",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was charged at do?",
              "answer": "baaed",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "shark",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the shark's action?",
              "answer": "the elephant attacking the sheep which led to the sheep charging at the shark",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "shark",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the shark's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "shark",
              "is_middle_entity": false
            }
          ],
          "sheep": [
            {
              "question": "What did the sheep do?",
              "answer": "charge at the shark",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "sheep",
              "is_middle_entity": true
            },
            {
              "question": "What attacked the sheep?",
              "answer": "the elephant",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "sheep",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "sheep",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was attacked do?",
              "answer": "charged at the shark",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "sheep",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the sheep's action?",
              "answer": "the elephant attacking the sheep",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "sheep",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the sheep's involvement?",
              "answer": "the shark baaed",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "sheep",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 18
      },
      {
        "id": "complexity_2_sentence_20",
        "sentence": "The mailman that the photographer that the waiter delivered mail to seated photographed.",
        "structure": [
          {
            "subject": "mailman",
            "action": "photographed",
            "object": null
          },
          {
            "subject": "photographer",
            "action": "seated",
            "object": "mailman"
          },
          {
            "subject": "waiter",
            "action": "delivered mail to",
            "object": "photographer"
          }
        ],
        "middle_entity": "photographer",
        "all_entities": [
          "mailman",
          "waiter",
          "photographer"
        ],
        "questions_by_entity": {
          "mailman": [
            {
              "question": "What did the mailman do?",
              "answer": "photograph",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "Who seated the mailman?",
              "answer": "the photographer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was seated do?",
              "answer": "photographed",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the mailman's action?",
              "answer": "the waiter delivering mail to the photographer which led to the photographer seating the mailman",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the mailman's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "mailman",
              "is_middle_entity": false
            }
          ],
          "waiter": [
            {
              "question": "What did the waiter do?",
              "answer": "deliver mail to the photographer",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "Who was affected by the waiter?",
              "answer": "the photographer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the waiter do?",
              "answer": "seated the mailman",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the waiter's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the waiter's involvement?",
              "answer": "the photographer seated the mailman",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "waiter",
              "is_middle_entity": false
            }
          ],
          "photographer": [
            {
              "question": "What did the photographer do?",
              "answer": "seat the mailman",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "photographer",
              "is_middle_entity": true
            },
            {
              "question": "Who delivered mail to the photographer?",
              "answer": "the waiter",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "photographer",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "photographer",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was delivered mail do?",
              "answer": "seated the mailman",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "photographer",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the photographer's action?",
              "answer": "the waiter delivering mail to the photographer",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "photographer",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the photographer's involvement?",
              "answer": "the mailman photographed",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "photographer",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 18
      },
      {
        "id": "complexity_2_sentence_21",
        "sentence": "The tuna that the camel that the dog schooled with barked at humped.",
        "structure": [
          {
            "subject": "tuna",
            "action": "humped",
            "object": null
          },
          {
            "subject": "camel",
            "action": "barked at",
            "object": "tuna"
          },
          {
            "subject": "dog",
            "action": "schooled with",
            "object": "camel"
          }
        ],
        "middle_entity": "camel",
        "all_entities": [
          "camel",
          "tuna",
          "dog"
        ],
        "questions_by_entity": {
          "camel": [
            {
              "question": "What did the camel do?",
              "answer": "bark at the tuna",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "camel",
              "is_middle_entity": true
            },
            {
              "question": "What schooled with the camel?",
              "answer": "the dog",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "camel",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "camel",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was schooled with do?",
              "answer": "barked at the tuna",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "camel",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the camel's action?",
              "answer": "the dog schooling with the camel",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "camel",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the camel's involvement?",
              "answer": "the tuna humped",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "camel",
              "is_middle_entity": true
            }
          ],
          "tuna": [
            {
              "question": "What did the tuna do?",
              "answer": "hump",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "tuna",
              "is_middle_entity": false
            },
            {
              "question": "What barked at the tuna?",
              "answer": "the camel",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "tuna",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "tuna",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was barked at do?",
              "answer": "humped",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "tuna",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the tuna's action?",
              "answer": "the dog schooling with the camel which led to the camel barking at the tuna",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "tuna",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the tuna's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "tuna",
              "is_middle_entity": false
            }
          ],
          "dog": [
            {
              "question": "What did the dog do?",
              "answer": "school with the camel",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "dog",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the dog?",
              "answer": "the camel",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "dog",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "dog",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the dog do?",
              "answer": "barked at the tuna",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "dog",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the dog's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "dog",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the dog's involvement?",
              "answer": "the camel barked at the tuna",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "dog",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 18
      },
      {
        "id": "complexity_2_sentence_22",
        "sentence": "The principal that the lawyer that the judge expelled gaveled argued.",
        "structure": [
          {
            "subject": "principal",
            "action": "argued",
            "object": null
          },
          {
            "subject": "lawyer",
            "action": "gaveled",
            "object": "principal"
          },
          {
            "subject": "judge",
            "action": "expelled",
            "object": "lawyer"
          }
        ],
        "middle_entity": "lawyer",
        "all_entities": [
          "principal",
          "lawyer",
          "judge"
        ],
        "questions_by_entity": {
          "principal": [
            {
              "question": "What did the principal do?",
              "answer": "argue",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "Who gaveled the principal?",
              "answer": "the lawyer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was gaveled do?",
              "answer": "argued",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the principal's action?",
              "answer": "the judge expelling the lawyer which led to the lawyer gaveling the principal",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the principal's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "principal",
              "is_middle_entity": false
            }
          ],
          "lawyer": [
            {
              "question": "What did the lawyer do?",
              "answer": "gavel the principal",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "lawyer",
              "is_middle_entity": true
            },
            {
              "question": "Who expelled the lawyer?",
              "answer": "the judge",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "lawyer",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "lawyer",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was expelled do?",
              "answer": "gaveled the principal",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "lawyer",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the lawyer's action?",
              "answer": "the judge expelling the lawyer",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "lawyer",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the lawyer's involvement?",
              "answer": "the principal argued",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "lawyer",
              "is_middle_entity": true
            }
          ],
          "judge": [
            {
              "question": "What did the judge do?",
              "answer": "expel the lawyer",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "Who was affected by the judge?",
              "answer": "the lawyer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the judge do?",
              "answer": "gaveled the principal",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the judge's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the judge's involvement?",
              "answer": "the lawyer gaveled the principal",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "judge",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 18
      },
      {
        "id": "complexity_2_sentence_23",
        "sentence": "The train that the motorcycle that the truck whistled at jackknifed into wheelied.",
        "structure": [
          {
            "subject": "train",
            "action": "wheelied",
            "object": null
          },
          {
            "subject": "motorcycle",
            "action": "jackknifed into",
            "object": "train"
          },
          {
            "subject": "truck",
            "action": "whistled at",
            "object": "motorcycle"
          }
        ],
        "middle_entity": "motorcycle",
        "all_entities": [
          "train",
          "motorcycle",
          "truck"
        ],
        "questions_by_entity": {
          "train": [
            {
              "question": "What did the train do?",
              "answer": "wheelie",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What jackknifed into the train?",
              "answer": "the motorcycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was jackknifed into do?",
              "answer": "wheelied",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the train's action?",
              "answer": "the truck whistling at the motorcycle which led to the motorcycle jackknifing into the train",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the train's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            }
          ],
          "motorcycle": [
            {
              "question": "What did the motorcycle do?",
              "answer": "jackknife into the train",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "What whistled at the motorcycle?",
              "answer": "the truck",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was whistled at do?",
              "answer": "jackknifed into the train",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the motorcycle's action?",
              "answer": "the truck whistling at the motorcycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the motorcycle's involvement?",
              "answer": "the train wheelied",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": true
            }
          ],
          "truck": [
            {
              "question": "What did the truck do?",
              "answer": "whistle at the motorcycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the truck?",
              "answer": "the motorcycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the truck do?",
              "answer": "jackknifed into the train",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the truck's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the truck's involvement?",
              "answer": "the motorcycle jackknifed into the train",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 18
      },
      {
        "id": "complexity_2_sentence_24",
        "sentence": "The surgeon that the teacher that the photographer incised photographed taught.",
        "structure": [
          {
            "subject": "surgeon",
            "action": "taught",
            "object": null
          },
          {
            "subject": "teacher",
            "action": "photographed",
            "object": "surgeon"
          },
          {
            "subject": "photographer",
            "action": "incised",
            "object": "teacher"
          }
        ],
        "middle_entity": "teacher",
        "all_entities": [
          "photographer",
          "surgeon",
          "teacher"
        ],
        "questions_by_entity": {
          "photographer": [
            {
              "question": "What did the photographer do?",
              "answer": "incise the teacher",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "Who was affected by the photographer?",
              "answer": "the teacher",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the photographer do?",
              "answer": "photographed the surgeon",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the photographer's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the photographer's involvement?",
              "answer": "the teacher photographed the surgeon",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "photographer",
              "is_middle_entity": false
            }
          ],
          "surgeon": [
            {
              "question": "What did the surgeon do?",
              "answer": "teach",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "Who photographed the surgeon?",
              "answer": "the teacher",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was photographed do?",
              "answer": "taught",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the surgeon's action?",
              "answer": "the photographer incising the teacher which led to the teacher photographing the surgeon",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the surgeon's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "surgeon",
              "is_middle_entity": false
            }
          ],
          "teacher": [
            {
              "question": "What did the teacher do?",
              "answer": "photograph the surgeon",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "teacher",
              "is_middle_entity": true
            },
            {
              "question": "Who incised the teacher?",
              "answer": "the photographer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "teacher",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "teacher",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was incised do?",
              "answer": "photographed the surgeon",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "teacher",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the teacher's action?",
              "answer": "the photographer incising the teacher",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "teacher",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the teacher's involvement?",
              "answer": "the surgeon taught",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "teacher",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 18
      },
      {
        "id": "complexity_2_sentence_25",
        "sentence": "The nurse that the photographer that the principal administered shots to suspended photographed.",
        "structure": [
          {
            "subject": "nurse",
            "action": "photographed",
            "object": null
          },
          {
            "subject": "photographer",
            "action": "suspended",
            "object": "nurse"
          },
          {
            "subject": "principal",
            "action": "administered shots to",
            "object": "photographer"
          }
        ],
        "middle_entity": "photographer",
        "all_entities": [
          "nurse",
          "principal",
          "photographer"
        ],
        "questions_by_entity": {
          "nurse": [
            {
              "question": "What did the nurse do?",
              "answer": "photograph",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "Who suspended the nurse?",
              "answer": "the photographer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was suspended do?",
              "answer": "photographed",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the nurse's action?",
              "answer": "the principal administering shots to the photographer which led to the photographer suspending the nurse",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the nurse's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "nurse",
              "is_middle_entity": false
            }
          ],
          "principal": [
            {
              "question": "What did the principal do?",
              "answer": "administer shots to the photographer",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "Who was affected by the principal?",
              "answer": "the photographer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the principal do?",
              "answer": "suspended the nurse",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the principal's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the principal's involvement?",
              "answer": "the photographer suspended the nurse",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "principal",
              "is_middle_entity": false
            }
          ],
          "photographer": [
            {
              "question": "What did the photographer do?",
              "answer": "suspend the nurse",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "photographer",
              "is_middle_entity": true
            },
            {
              "question": "Who administered shots to the photographer?",
              "answer": "the principal",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "photographer",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "photographer",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was administered shots do?",
              "answer": "suspended the nurse",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "photographer",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the photographer's action?",
              "answer": "the principal administering shots to the photographer",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "photographer",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the photographer's involvement?",
              "answer": "the nurse photographed",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "photographer",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 18
      },
      {
        "id": "complexity_2_sentence_26",
        "sentence": "The whale that the vulture that the lizard spouted at basked toward scavenged.",
        "structure": [
          {
            "subject": "whale",
            "action": "scavenged",
            "object": null
          },
          {
            "subject": "vulture",
            "action": "basked toward",
            "object": "whale"
          },
          {
            "subject": "lizard",
            "action": "spouted at",
            "object": "vulture"
          }
        ],
        "middle_entity": "vulture",
        "all_entities": [
          "lizard",
          "whale",
          "vulture"
        ],
        "questions_by_entity": {
          "lizard": [
            {
              "question": "What did the lizard do?",
              "answer": "spout at the vulture",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "lizard",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the lizard?",
              "answer": "the vulture",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "lizard",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "lizard",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the lizard do?",
              "answer": "basked toward the whale",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "lizard",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the lizard's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "lizard",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the lizard's involvement?",
              "answer": "the vulture basked toward the whale",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "lizard",
              "is_middle_entity": false
            }
          ],
          "whale": [
            {
              "question": "What did the whale do?",
              "answer": "scavenge",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "whale",
              "is_middle_entity": false
            },
            {
              "question": "What basked toward the whale?",
              "answer": "the vulture",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "whale",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "whale",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was basked toward do?",
              "answer": "scavenged",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "whale",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the whale's action?",
              "answer": "the lizard spouting at the vulture which led to the vulture basking toward the whale",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "whale",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the whale's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "whale",
              "is_middle_entity": false
            }
          ],
          "vulture": [
            {
              "question": "What did the vulture do?",
              "answer": "bask toward the whale",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "vulture",
              "is_middle_entity": true
            },
            {
              "question": "What spouted at the vulture?",
              "answer": "the lizard",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "vulture",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "vulture",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was spouted at do?",
              "answer": "basked toward the whale",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "vulture",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the vulture's action?",
              "answer": "the lizard spouting at the vulture",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "vulture",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the vulture's involvement?",
              "answer": "the whale scavenged",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "vulture",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 18
      },
      {
        "id": "complexity_2_sentence_27",
        "sentence": "The giraffe that the cow that the cobra stretched toward reared at mooed.",
        "structure": [
          {
            "subject": "giraffe",
            "action": "mooed",
            "object": null
          },
          {
            "subject": "cow",
            "action": "reared at",
            "object": "giraffe"
          },
          {
            "subject": "cobra",
            "action": "stretched toward",
            "object": "cow"
          }
        ],
        "middle_entity": "cow",
        "all_entities": [
          "cow",
          "giraffe",
          "cobra"
        ],
        "questions_by_entity": {
          "cow": [
            {
              "question": "What did the cow do?",
              "answer": "rear at the giraffe",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "cow",
              "is_middle_entity": true
            },
            {
              "question": "What stretched toward the cow?",
              "answer": "the cobra",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "cow",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "cow",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was stretched toward do?",
              "answer": "reared at the giraffe",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "cow",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the cow's action?",
              "answer": "the cobra stretching toward the cow",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "cow",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the cow's involvement?",
              "answer": "the giraffe mooed",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "cow",
              "is_middle_entity": true
            }
          ],
          "giraffe": [
            {
              "question": "What did the giraffe do?",
              "answer": "moo",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "giraffe",
              "is_middle_entity": false
            },
            {
              "question": "What reared at the giraffe?",
              "answer": "the cow",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "giraffe",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "giraffe",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was reared at do?",
              "answer": "mooed",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "giraffe",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the giraffe's action?",
              "answer": "the cobra stretching toward the cow which led to the cow rearing at the giraffe",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "giraffe",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the giraffe's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "giraffe",
              "is_middle_entity": false
            }
          ],
          "cobra": [
            {
              "question": "What did the cobra do?",
              "answer": "stretch toward the cow",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "cobra",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the cobra?",
              "answer": "the cow",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "cobra",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "cobra",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the cobra do?",
              "answer": "reared at the giraffe",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "cobra",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the cobra's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "cobra",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the cobra's involvement?",
              "answer": "the cow reared at the giraffe",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "cobra",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 18
      },
      {
        "id": "complexity_2_sentence_28",
        "sentence": "The horse that the donkey that the cat neighed at meowed at brayed.",
        "structure": [
          {
            "subject": "horse",
            "action": "brayed",
            "object": null
          },
          {
            "subject": "donkey",
            "action": "meowed at",
            "object": "horse"
          },
          {
            "subject": "cat",
            "action": "neighed at",
            "object": "donkey"
          }
        ],
        "middle_entity": "donkey",
        "all_entities": [
          "donkey",
          "horse",
          "cat"
        ],
        "questions_by_entity": {
          "donkey": [
            {
              "question": "What did the donkey do?",
              "answer": "meow at the horse",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "donkey",
              "is_middle_entity": true
            },
            {
              "question": "What neighed at the donkey?",
              "answer": "the cat",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "donkey",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "donkey",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was neighed at do?",
              "answer": "meowed at the horse",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "donkey",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the donkey's action?",
              "answer": "the cat neighing at the donkey",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "donkey",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the donkey's involvement?",
              "answer": "the horse brayed",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "donkey",
              "is_middle_entity": true
            }
          ],
          "horse": [
            {
              "question": "What did the horse do?",
              "answer": "bray",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "horse",
              "is_middle_entity": false
            },
            {
              "question": "What meowed at the horse?",
              "answer": "the donkey",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "horse",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "horse",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was meowed at do?",
              "answer": "brayed",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "horse",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the horse's action?",
              "answer": "the cat neighing at the donkey which led to the donkey meowing at the horse",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "horse",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the horse's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "horse",
              "is_middle_entity": false
            }
          ],
          "cat": [
            {
              "question": "What did the cat do?",
              "answer": "neigh at the donkey",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "cat",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the cat?",
              "answer": "the donkey",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "cat",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "cat",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the cat do?",
              "answer": "meowed at the horse",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "cat",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the cat's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "cat",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the cat's involvement?",
              "answer": "the donkey meowed at the horse",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "cat",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 18
      },
      {
        "id": "complexity_2_sentence_29",
        "sentence": "The beaver that the shark that the giraffe gnawed at stretched toward attacked.",
        "structure": [
          {
            "subject": "beaver",
            "action": "attacked",
            "object": null
          },
          {
            "subject": "shark",
            "action": "stretched toward",
            "object": "beaver"
          },
          {
            "subject": "giraffe",
            "action": "gnawed at",
            "object": "shark"
          }
        ],
        "middle_entity": "shark",
        "all_entities": [
          "beaver",
          "shark",
          "giraffe"
        ],
        "questions_by_entity": {
          "beaver": [
            {
              "question": "What did the beaver do?",
              "answer": "attack",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "beaver",
              "is_middle_entity": false
            },
            {
              "question": "What stretched toward the beaver?",
              "answer": "the shark",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "beaver",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "beaver",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was stretched toward do?",
              "answer": "attacked",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "beaver",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the beaver's action?",
              "answer": "the giraffe gnawing at the shark which led to the shark stretching toward the beaver",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "beaver",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the beaver's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "beaver",
              "is_middle_entity": false
            }
          ],
          "shark": [
            {
              "question": "What did the shark do?",
              "answer": "stretch toward the beaver",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "shark",
              "is_middle_entity": true
            },
            {
              "question": "What gnawed at the shark?",
              "answer": "the giraffe",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "shark",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "shark",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was gnawed at do?",
              "answer": "stretched toward the beaver",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "shark",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the shark's action?",
              "answer": "the giraffe gnawing at the shark",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "shark",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the shark's involvement?",
              "answer": "the beaver attacked",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "shark",
              "is_middle_entity": true
            }
          ],
          "giraffe": [
            {
              "question": "What did the giraffe do?",
              "answer": "gnaw at the shark",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "giraffe",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the giraffe?",
              "answer": "the shark",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "giraffe",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "giraffe",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the giraffe do?",
              "answer": "stretched toward the beaver",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "giraffe",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the giraffe's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "giraffe",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the giraffe's involvement?",
              "answer": "the shark stretched toward the beaver",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "giraffe",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 18
      },
      {
        "id": "complexity_2_sentence_30",
        "sentence": "The airplane that the truck that the ambulance air-dropped on blared the siren at jackknifed.",
        "structure": [
          {
            "subject": "airplane",
            "action": "jackknifed",
            "object": null
          },
          {
            "subject": "truck",
            "action": "blared the siren at",
            "object": "airplane"
          },
          {
            "subject": "ambulance",
            "action": "air-dropped on",
            "object": "truck"
          }
        ],
        "middle_entity": "truck",
        "all_entities": [
          "airplane",
          "ambulance",
          "truck"
        ],
        "questions_by_entity": {
          "airplane": [
            {
              "question": "What did the airplane do?",
              "answer": "jackknife",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What blared the siren at the airplane?",
              "answer": "the truck",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was blared the siren at do?",
              "answer": "jackknifed",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the airplane's action?",
              "answer": "the ambulance air-dropping on the truck which led to the truck blaring the siren at the airplane",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the airplane's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            }
          ],
          "ambulance": [
            {
              "question": "What did the ambulance do?",
              "answer": "air-drop on the truck",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the ambulance?",
              "answer": "the truck",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the ambulance do?",
              "answer": "blared the siren at the airplane",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the ambulance's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the ambulance's involvement?",
              "answer": "the truck blared the siren at the airplane",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": false
            }
          ],
          "truck": [
            {
              "question": "What did the truck do?",
              "answer": "siren at the airplane",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": true
            },
            {
              "question": "What air-dropped on the truck?",
              "answer": "the ambulance",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "3",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was air-dropped on do?",
              "answer": "blared the siren at the airplane",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the truck's action?",
              "answer": "the ambulance air-dropping on the truck",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the truck's involvement?",
              "answer": "the airplane jackknifed",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 18
      }
    ],
    "total_questions": 540,
    "entities_processed": 90,
    "middle_entities_flagged": 30
  },
  "complexity_3": {
    "sentences": [
      {
        "id": "complexity_3_sentence_1",
        "sentence": "The truck that the bicycle that the motorcycle that the airplane jackknifed into strafed lane-split past pedaled.",
        "structure": [
          {
            "subject": "truck",
            "action": "pedaled",
            "object": null
          },
          {
            "subject": "bicycle",
            "action": "lane-split past",
            "object": "truck"
          },
          {
            "subject": "motorcycle",
            "action": "strafed",
            "object": "bicycle"
          },
          {
            "subject": "airplane",
            "action": "jackknifed into",
            "object": "motorcycle"
          }
        ],
        "middle_entity": "bicycle",
        "all_entities": [
          "airplane",
          "bicycle",
          "motorcycle",
          "truck"
        ],
        "questions_by_entity": {
          "airplane": [
            {
              "question": "What did the airplane do?",
              "answer": "jackknife into the motorcycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the airplane?",
              "answer": "the motorcycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the airplane do?",
              "answer": "strafed the bicycle",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the airplane's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the airplane's involvement?",
              "answer": "the motorcycle strafed the bicycle",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            }
          ],
          "bicycle": [
            {
              "question": "What did the bicycle do?",
              "answer": "lane-split past the truck",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": true
            },
            {
              "question": "What strafed the bicycle?",
              "answer": "the motorcycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was strafed do?",
              "answer": "lane-split past the truck",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the bicycle's action?",
              "answer": "the airplane jackknifing into the motorcycle which led to the motorcycle strafing the bicycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the bicycle's involvement?",
              "answer": "the truck pedaled",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": true
            }
          ],
          "motorcycle": [
            {
              "question": "What did the motorcycle do?",
              "answer": "strafe the bicycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What jackknifed into the motorcycle?",
              "answer": "the airplane",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was jackknifed into do?",
              "answer": "strafed the bicycle",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the motorcycle's action?",
              "answer": "the airplane jackknifing into the motorcycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the motorcycle's involvement?",
              "answer": "the bicycle lane-split past the truck",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": false
            }
          ],
          "truck": [
            {
              "question": "What did the truck do?",
              "answer": "pedal",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What lane-split past the truck?",
              "answer": "the bicycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was lane-split past do?",
              "answer": "pedaled",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the truck's action?",
              "answer": "the airplane jackknifing into the motorcycle which led to the motorcycle strafing the bicycle which led to the bicycle lane-splitting past the truck",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the truck's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 24
      },
      {
        "id": "complexity_3_sentence_2",
        "sentence": "The spaceship that the bicycle that the ambulance that the boat orbited moored to blared the siren at pedaled.",
        "structure": [
          {
            "subject": "spaceship",
            "action": "pedaled",
            "object": null
          },
          {
            "subject": "bicycle",
            "action": "blared the siren at",
            "object": "spaceship"
          },
          {
            "subject": "ambulance",
            "action": "moored to",
            "object": "bicycle"
          },
          {
            "subject": "boat",
            "action": "orbited",
            "object": "ambulance"
          }
        ],
        "middle_entity": "bicycle",
        "all_entities": [
          "ambulance",
          "bicycle",
          "spaceship",
          "boat"
        ],
        "questions_by_entity": {
          "ambulance": [
            {
              "question": "What did the ambulance do?",
              "answer": "moor to the bicycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What orbited the ambulance?",
              "answer": "the boat",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was orbited do?",
              "answer": "moored to the bicycle",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the ambulance's action?",
              "answer": "the boat orbiting the ambulance",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the ambulance's involvement?",
              "answer": "the bicycle blared the siren at the spaceship",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": false
            }
          ],
          "bicycle": [
            {
              "question": "What did the bicycle do?",
              "answer": "siren at the spaceship",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": true
            },
            {
              "question": "What moored to the bicycle?",
              "answer": "the ambulance",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was moored do?",
              "answer": "blared the siren at the spaceship",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the bicycle's action?",
              "answer": "the boat orbiting the ambulance which led to the ambulance mooring to the bicycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the bicycle's involvement?",
              "answer": "the spaceship pedaled",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": true
            }
          ],
          "spaceship": [
            {
              "question": "What did the spaceship do?",
              "answer": "pedal",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What blared the siren at the spaceship?",
              "answer": "the bicycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was blared the siren at do?",
              "answer": "pedaled",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the spaceship's action?",
              "answer": "the boat orbiting the ambulance which led to the ambulance mooring to the bicycle which led to the bicycle blaring the siren at the spaceship",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the spaceship's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            }
          ],
          "boat": [
            {
              "question": "What did the boat do?",
              "answer": "orbit the ambulance",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the boat?",
              "answer": "the ambulance",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the boat do?",
              "answer": "moored to the bicycle",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the boat's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the boat's involvement?",
              "answer": "the ambulance moored to the bicycle",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 24
      },
      {
        "id": "complexity_3_sentence_3",
        "sentence": "The judge that the teacher that the surgeon that the firefighter gaveled rescued sutured taught.",
        "structure": [
          {
            "subject": "judge",
            "action": "taught",
            "object": null
          },
          {
            "subject": "teacher",
            "action": "sutured",
            "object": "judge"
          },
          {
            "subject": "surgeon",
            "action": "rescued",
            "object": "teacher"
          },
          {
            "subject": "firefighter",
            "action": "gaveled",
            "object": "surgeon"
          }
        ],
        "middle_entity": "teacher",
        "all_entities": [
          "firefighter",
          "judge",
          "surgeon",
          "teacher"
        ],
        "questions_by_entity": {
          "firefighter": [
            {
              "question": "What did the firefighter do?",
              "answer": "gavel the surgeon",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "Who was affected by the firefighter?",
              "answer": "the surgeon",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the firefighter do?",
              "answer": "rescued the teacher",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the firefighter's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the firefighter's involvement?",
              "answer": "the surgeon rescued the teacher",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "firefighter",
              "is_middle_entity": false
            }
          ],
          "judge": [
            {
              "question": "What did the judge do?",
              "answer": "teach",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "Who sutured the judge?",
              "answer": "the teacher",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was sutured do?",
              "answer": "taught",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the judge's action?",
              "answer": "the firefighter gaveling the surgeon which led to the surgeon rescuing the teacher which led to the teacher suturing the judge",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the judge's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "judge",
              "is_middle_entity": false
            }
          ],
          "surgeon": [
            {
              "question": "What did the surgeon do?",
              "answer": "rescue the teacher",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "Who gaveled the surgeon?",
              "answer": "the firefighter",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was gaveled do?",
              "answer": "rescued the teacher",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the surgeon's action?",
              "answer": "the firefighter gaveling the surgeon",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the surgeon's involvement?",
              "answer": "the teacher sutured the judge",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "surgeon",
              "is_middle_entity": false
            }
          ],
          "teacher": [
            {
              "question": "What did the teacher do?",
              "answer": "suture the judge",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "teacher",
              "is_middle_entity": true
            },
            {
              "question": "Who rescued the teacher?",
              "answer": "the surgeon",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "teacher",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "teacher",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was rescued do?",
              "answer": "sutured the judge",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "teacher",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the teacher's action?",
              "answer": "the firefighter gaveling the surgeon which led to the surgeon rescuing the teacher",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "teacher",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the teacher's involvement?",
              "answer": "the judge taught",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "teacher",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 24
      },
      {
        "id": "complexity_3_sentence_4",
        "sentence": "The boat that the train that the bicycle that the truck moored to jackknifed into cycled around steamed.",
        "structure": [
          {
            "subject": "boat",
            "action": "steamed",
            "object": null
          },
          {
            "subject": "train",
            "action": "cycled around",
            "object": "boat"
          },
          {
            "subject": "bicycle",
            "action": "jackknifed into",
            "object": "train"
          },
          {
            "subject": "truck",
            "action": "moored to",
            "object": "bicycle"
          }
        ],
        "middle_entity": "train",
        "all_entities": [
          "train",
          "boat",
          "bicycle",
          "truck"
        ],
        "questions_by_entity": {
          "train": [
            {
              "question": "What did the train do?",
              "answer": "cycle around the boat",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": true
            },
            {
              "question": "What jackknifed into the train?",
              "answer": "the bicycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was jackknifed into do?",
              "answer": "cycled around the boat",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the train's action?",
              "answer": "the truck mooring to the bicycle which led to the bicycle jackknifing into the train",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the train's involvement?",
              "answer": "the boat steamed",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": true
            }
          ],
          "boat": [
            {
              "question": "What did the boat do?",
              "answer": "steam",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What cycled around the boat?",
              "answer": "the train",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was cycled around do?",
              "answer": "steamed",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the boat's action?",
              "answer": "the truck mooring to the bicycle which led to the bicycle jackknifing into the train which led to the train cycling around the boat",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the boat's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            }
          ],
          "bicycle": [
            {
              "question": "What did the bicycle do?",
              "answer": "jackknife into the train",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What moored to the bicycle?",
              "answer": "the truck",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was moored do?",
              "answer": "jackknifed into the train",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the bicycle's action?",
              "answer": "the truck mooring to the bicycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the bicycle's involvement?",
              "answer": "the train cycled around the boat",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": false
            }
          ],
          "truck": [
            {
              "question": "What did the truck do?",
              "answer": "moor to the bicycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the truck?",
              "answer": "the bicycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the truck do?",
              "answer": "jackknifed into the train",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the truck's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the truck's involvement?",
              "answer": "the bicycle jackknifed into the train",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 24
      },
      {
        "id": "complexity_3_sentence_5",
        "sentence": "The surgeon that the waiter that the nurse that the firefighter sutured carried out bandaged served food.",
        "structure": [
          {
            "subject": "surgeon",
            "action": "served food",
            "object": null
          },
          {
            "subject": "waiter",
            "action": "bandaged",
            "object": "surgeon"
          },
          {
            "subject": "nurse",
            "action": "carried out",
            "object": "waiter"
          },
          {
            "subject": "firefighter",
            "action": "sutured",
            "object": "nurse"
          }
        ],
        "middle_entity": "waiter",
        "all_entities": [
          "nurse",
          "firefighter",
          "waiter",
          "surgeon"
        ],
        "questions_by_entity": {
          "nurse": [
            {
              "question": "What did the nurse do?",
              "answer": "carry the waiter out",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "Who sutured the nurse?",
              "answer": "the firefighter",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was sutured do?",
              "answer": "carried the waiter out",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the nurse's action?",
              "answer": "the firefighter suturing the nurse",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the nurse's involvement?",
              "answer": "the waiter bandaged the surgeon",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "nurse",
              "is_middle_entity": false
            }
          ],
          "firefighter": [
            {
              "question": "What did the firefighter do?",
              "answer": "suture the nurse",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "Who was affected by the firefighter?",
              "answer": "the nurse",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the firefighter do?",
              "answer": "carried the waiter  out",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the firefighter's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the firefighter's involvement?",
              "answer": "the nurse carried the waiter out",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "firefighter",
              "is_middle_entity": false
            }
          ],
          "waiter": [
            {
              "question": "What did the waiter do?",
              "answer": "bandage the surgeon",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "waiter",
              "is_middle_entity": true
            },
            {
              "question": "Who carried out the waiter?",
              "answer": "the nurse",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "waiter",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "waiter",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was carried out do?",
              "answer": "bandaged the surgeon",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "waiter",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the waiter's action?",
              "answer": "the firefighter suturing the nurse which led to the nurse carrying the waiter out",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "waiter",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the waiter's involvement?",
              "answer": "the surgeon served food",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "waiter",
              "is_middle_entity": true
            }
          ],
          "surgeon": [
            {
              "question": "What did the surgeon do?",
              "answer": "serve food",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "Who bandaged the surgeon?",
              "answer": "the waiter",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was bandaged do?",
              "answer": "served food",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the surgeon's action?",
              "answer": "the firefighter suturing the nurse which led to the nurse carrying the waiter out which led to the waiter bandaging the surgeon",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the surgeon's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "surgeon",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 24
      },
      {
        "id": "complexity_3_sentence_6",
        "sentence": "The skunk that the lion that the bat that the elephant sprayed at trumpeted at echolocated roared.",
        "structure": [
          {
            "subject": "skunk",
            "action": "roared",
            "object": null
          },
          {
            "subject": "lion",
            "action": "echolocated",
            "object": "skunk"
          },
          {
            "subject": "bat",
            "action": "trumpeted at",
            "object": "lion"
          },
          {
            "subject": "elephant",
            "action": "sprayed at",
            "object": "bat"
          }
        ],
        "middle_entity": "lion",
        "all_entities": [
          "elephant",
          "skunk",
          "bat",
          "lion"
        ],
        "questions_by_entity": {
          "elephant": [
            {
              "question": "What did the elephant do?",
              "answer": "spray at the bat",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "elephant",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the elephant?",
              "answer": "the bat",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "elephant",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "elephant",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the elephant do?",
              "answer": "trumpeted at the lion",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "elephant",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the elephant's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "elephant",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the elephant's involvement?",
              "answer": "the bat trumpeted at the lion",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "elephant",
              "is_middle_entity": false
            }
          ],
          "skunk": [
            {
              "question": "What did the skunk do?",
              "answer": "roar",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "skunk",
              "is_middle_entity": false
            },
            {
              "question": "What echolocated the skunk?",
              "answer": "the lion",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "skunk",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "skunk",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was echolocated do?",
              "answer": "roared",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "skunk",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the skunk's action?",
              "answer": "the elephant spraying at the bat which led to the bat trumpeting at the lion which led to the lion echolocating the skunk",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "skunk",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the skunk's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "skunk",
              "is_middle_entity": false
            }
          ],
          "bat": [
            {
              "question": "What did the bat do?",
              "answer": "trumpet at the lion",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "bat",
              "is_middle_entity": false
            },
            {
              "question": "What sprayed at the bat?",
              "answer": "the elephant",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "bat",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "bat",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was sprayed at do?",
              "answer": "trumpeted at the lion",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "bat",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the bat's action?",
              "answer": "the elephant spraying at the bat",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "bat",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the bat's involvement?",
              "answer": "the lion echolocated the skunk",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "bat",
              "is_middle_entity": false
            }
          ],
          "lion": [
            {
              "question": "What did the lion do?",
              "answer": "echolocate the skunk",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "lion",
              "is_middle_entity": true
            },
            {
              "question": "What trumpeted at the lion?",
              "answer": "the bat",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "lion",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "lion",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was trumpeted at do?",
              "answer": "echolocated the skunk",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "lion",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the lion's action?",
              "answer": "the elephant spraying at the bat which led to the bat trumpeting at the lion",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "lion",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the lion's involvement?",
              "answer": "the skunk roared",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "lion",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 24
      },
      {
        "id": "complexity_3_sentence_7",
        "sentence": "The boat that the truck that the spaceship that the ambulance sailed past blared the siren at orbited jackknifed.",
        "structure": [
          {
            "subject": "boat",
            "action": "jackknifed",
            "object": null
          },
          {
            "subject": "truck",
            "action": "orbited",
            "object": "boat"
          },
          {
            "subject": "spaceship",
            "action": "blared the siren at",
            "object": "truck"
          },
          {
            "subject": "ambulance",
            "action": "sailed past",
            "object": "spaceship"
          }
        ],
        "middle_entity": "truck",
        "all_entities": [
          "ambulance",
          "boat",
          "spaceship",
          "truck"
        ],
        "questions_by_entity": {
          "ambulance": [
            {
              "question": "What did the ambulance do?",
              "answer": "sail past the spaceship",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the ambulance?",
              "answer": "the spaceship",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the ambulance do?",
              "answer": "blared the siren at the truck",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the ambulance's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the ambulance's involvement?",
              "answer": "the spaceship blared the siren at the truck",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": false
            }
          ],
          "boat": [
            {
              "question": "What did the boat do?",
              "answer": "jackknife",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What orbited the boat?",
              "answer": "the truck",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was orbited do?",
              "answer": "jackknifed",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the boat's action?",
              "answer": "the ambulance sailing past the spaceship which led to the spaceship blaring the siren at the truck which led to the truck orbiting the boat",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the boat's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            }
          ],
          "spaceship": [
            {
              "question": "What did the spaceship do?",
              "answer": "siren at the truck",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What sailed past the spaceship?",
              "answer": "the ambulance",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was sailed past do?",
              "answer": "blared the siren at the truck",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the spaceship's action?",
              "answer": "the ambulance sailing past the spaceship",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the spaceship's involvement?",
              "answer": "the truck orbited the boat",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            }
          ],
          "truck": [
            {
              "question": "What did the truck do?",
              "answer": "orbit the boat",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": true
            },
            {
              "question": "What blared the siren at the truck?",
              "answer": "the spaceship",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was blared the siren at do?",
              "answer": "orbited the boat",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the truck's action?",
              "answer": "the ambulance sailing past the spaceship which led to the spaceship blaring the siren at the truck",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the truck's involvement?",
              "answer": "the boat jackknifed",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 24
      },
      {
        "id": "complexity_3_sentence_8",
        "sentence": "The waiter that the surgeon that the mailman that the teacher took food orders from assigned homework to delivered mail to operated.",
        "structure": [
          {
            "subject": "waiter",
            "action": "operated",
            "object": null
          },
          {
            "subject": "surgeon",
            "action": "delivered mail to",
            "object": "waiter"
          },
          {
            "subject": "mailman",
            "action": "assigned homework to",
            "object": "surgeon"
          },
          {
            "subject": "teacher",
            "action": "took food orders from",
            "object": "mailman"
          }
        ],
        "middle_entity": "surgeon",
        "all_entities": [
          "mailman",
          "waiter",
          "surgeon",
          "teacher"
        ],
        "questions_by_entity": {
          "mailman": [
            {
              "question": "What did the mailman do?",
              "answer": "assign homework to the surgeon",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "Who took food orders from the mailman?",
              "answer": "the teacher",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity whose orders were taken do?",
              "answer": "assigned homework to the surgeon",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the mailman's action?",
              "answer": "the teacher taking food orders from the mailman",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the mailman's involvement?",
              "answer": "the surgeon delivered mail to the waiter",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "mailman",
              "is_middle_entity": false
            }
          ],
          "waiter": [
            {
              "question": "What did the waiter do?",
              "answer": "operate",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "Who delivered mail to the waiter?",
              "answer": "the surgeon",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was delivered mail do?",
              "answer": "operated",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the waiter's action?",
              "answer": "the teacher taking food orders from the mailman which led to the mailman assigning homework to the surgeon which led to the surgeon delivering mail to the waiter",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the waiter's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "waiter",
              "is_middle_entity": false
            }
          ],
          "surgeon": [
            {
              "question": "What did the surgeon do?",
              "answer": "deliver mail to the waiter",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "surgeon",
              "is_middle_entity": true
            },
            {
              "question": "Who assigned homework to the surgeon?",
              "answer": "the mailman",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "surgeon",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "surgeon",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was assigned homework do?",
              "answer": "delivered mail to the waiter",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "surgeon",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the surgeon's action?",
              "answer": "the teacher taking food orders from the mailman which led to the mailman assigning homework to the surgeon",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "surgeon",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the surgeon's involvement?",
              "answer": "the waiter operated",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "surgeon",
              "is_middle_entity": true
            }
          ],
          "teacher": [
            {
              "question": "What did the teacher do?",
              "answer": "take food orders from the mailman",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "Who was affected by the teacher?",
              "answer": "the mailman",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the teacher do?",
              "answer": "assigned homework to the surgeon",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the teacher's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the teacher's involvement?",
              "answer": "the mailman assigned homework to the surgeon",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "teacher",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 24
      },
      {
        "id": "complexity_3_sentence_9",
        "sentence": "The photographer that the teacher that the surgeon that the lawyer shot subpoenaed sutured taught.",
        "structure": [
          {
            "subject": "photographer",
            "action": "taught",
            "object": null
          },
          {
            "subject": "teacher",
            "action": "sutured",
            "object": "photographer"
          },
          {
            "subject": "surgeon",
            "action": "subpoenaed",
            "object": "teacher"
          },
          {
            "subject": "lawyer",
            "action": "shot",
            "object": "surgeon"
          }
        ],
        "middle_entity": "teacher",
        "all_entities": [
          "surgeon",
          "lawyer",
          "photographer",
          "teacher"
        ],
        "questions_by_entity": {
          "surgeon": [
            {
              "question": "What did the surgeon do?",
              "answer": "subpoena the teacher",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "Who shot the surgeon?",
              "answer": "the lawyer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was shot do?",
              "answer": "subpoenaed the teacher",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the surgeon's action?",
              "answer": "the lawyer shooting the surgeon",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the surgeon's involvement?",
              "answer": "the teacher sutured the photographer",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "surgeon",
              "is_middle_entity": false
            }
          ],
          "lawyer": [
            {
              "question": "What did the lawyer do?",
              "answer": "shoot the surgeon",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "Who was affected by the lawyer?",
              "answer": "the surgeon",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the lawyer do?",
              "answer": "subpoenaed the teacher",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the lawyer's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the lawyer's involvement?",
              "answer": "the surgeon subpoenaed the teacher",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "lawyer",
              "is_middle_entity": false
            }
          ],
          "photographer": [
            {
              "question": "What did the photographer do?",
              "answer": "teach",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "Who sutured the photographer?",
              "answer": "the teacher",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was sutured do?",
              "answer": "taught",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the photographer's action?",
              "answer": "the lawyer shooting the surgeon which led to the surgeon subpoenaing the teacher which led to the teacher suturing the photographer",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the photographer's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "photographer",
              "is_middle_entity": false
            }
          ],
          "teacher": [
            {
              "question": "What did the teacher do?",
              "answer": "suture the photographer",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "teacher",
              "is_middle_entity": true
            },
            {
              "question": "Who subpoenaed the teacher?",
              "answer": "the surgeon",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "teacher",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "teacher",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was subpoenaed do?",
              "answer": "sutured the photographer",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "teacher",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the teacher's action?",
              "answer": "the lawyer shooting the surgeon which led to the surgeon subpoenaing the teacher",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "teacher",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the teacher's involvement?",
              "answer": "the photographer taught",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "teacher",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 24
      },
      {
        "id": "complexity_3_sentence_10",
        "sentence": "The nurse that the judge that the police officer that the waiter bandaged took food orders from read rights to gaveled.",
        "structure": [
          {
            "subject": "nurse",
            "action": "gaveled",
            "object": null
          },
          {
            "subject": "judge",
            "action": "read rights to",
            "object": "nurse"
          },
          {
            "subject": "police officer",
            "action": "took food orders from",
            "object": "judge"
          },
          {
            "subject": "waiter",
            "action": "bandaged",
            "object": "police officer"
          }
        ],
        "middle_entity": "judge",
        "all_entities": [
          "nurse",
          "police officer",
          "waiter",
          "judge"
        ],
        "questions_by_entity": {
          "nurse": [
            {
              "question": "What did the nurse do?",
              "answer": "gavel",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "Who read rights to the nurse?",
              "answer": "the judge",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was read rights do?",
              "answer": "gaveled",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the nurse's action?",
              "answer": "the waiter bandaging the police officer which led to the police officer taking food orders from the judge which led to the judge reading rights to the nurse",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the nurse's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "nurse",
              "is_middle_entity": false
            }
          ],
          "police officer": [
            {
              "question": "What did the police officer do?",
              "answer": "take food orders from the judge",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "Who bandaged the police officer?",
              "answer": "the waiter",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was bandaged do?",
              "answer": "took food orders from the judge",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the police officer's action?",
              "answer": "the waiter bandaging the police officer",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the police officer's involvement?",
              "answer": "the judge read rights to the nurse",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "police officer",
              "is_middle_entity": false
            }
          ],
          "waiter": [
            {
              "question": "What did the waiter do?",
              "answer": "bandage the police officer",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "Who was affected by the waiter?",
              "answer": "the police officer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the waiter do?",
              "answer": "took food orders from the judge",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the waiter's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the waiter's involvement?",
              "answer": "the police officer took food orders from the judge",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "waiter",
              "is_middle_entity": false
            }
          ],
          "judge": [
            {
              "question": "What did the judge do?",
              "answer": "read rights to the nurse",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "judge",
              "is_middle_entity": true
            },
            {
              "question": "Who took food orders from the judge?",
              "answer": "the police officer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "judge",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "judge",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity whose orders were taken do?",
              "answer": "read rights to the nurse",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "judge",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the judge's action?",
              "answer": "the waiter bandaging the police officer which led to the police officer taking food orders from the judge",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "judge",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the judge's involvement?",
              "answer": "the nurse gaveled",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "judge",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 24
      },
      {
        "id": "complexity_3_sentence_11",
        "sentence": "The parrot that the duck that the pig that the dolphin mimicked squeaked at oinked at dabbled peacefully.",
        "structure": [
          {
            "subject": "parrot",
            "action": "dabbled peacefully",
            "object": null
          },
          {
            "subject": "duck",
            "action": "oinked at",
            "object": "parrot"
          },
          {
            "subject": "pig",
            "action": "squeaked at",
            "object": "duck"
          },
          {
            "subject": "dolphin",
            "action": "mimicked",
            "object": "pig"
          }
        ],
        "middle_entity": "duck",
        "all_entities": [
          "dolphin",
          "parrot",
          "pig",
          "duck"
        ],
        "questions_by_entity": {
          "dolphin": [
            {
              "question": "What did the dolphin do?",
              "answer": "mimic the pig",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "dolphin",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the dolphin?",
              "answer": "the pig",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "dolphin",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "dolphin",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the dolphin do?",
              "answer": "squeaked at the duck",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "dolphin",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the dolphin's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "dolphin",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the dolphin's involvement?",
              "answer": "the pig squeaked at the duck",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "dolphin",
              "is_middle_entity": false
            }
          ],
          "parrot": [
            {
              "question": "What did the parrot do?",
              "answer": "dabble peacefully",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "parrot",
              "is_middle_entity": false
            },
            {
              "question": "What oinked at the parrot?",
              "answer": "the duck",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "parrot",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "parrot",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was oinked at do?",
              "answer": "dabbled peacefully",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "parrot",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the parrot's action?",
              "answer": "the dolphin mimicking the pig which led to the pig squeaking at the duck which led to the duck oinking at the parrot",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "parrot",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the parrot's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "parrot",
              "is_middle_entity": false
            }
          ],
          "pig": [
            {
              "question": "What did the pig do?",
              "answer": "squeak at the duck",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "pig",
              "is_middle_entity": false
            },
            {
              "question": "What mimicked the pig?",
              "answer": "the dolphin",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "pig",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "pig",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was mimicked do?",
              "answer": "squeaked at the duck",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "pig",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the pig's action?",
              "answer": "the dolphin mimicking the pig",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "pig",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the pig's involvement?",
              "answer": "the duck oinked at the parrot",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "pig",
              "is_middle_entity": false
            }
          ],
          "duck": [
            {
              "question": "What did the duck do?",
              "answer": "oink at the parrot",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "duck",
              "is_middle_entity": true
            },
            {
              "question": "What squeaked at the duck?",
              "answer": "the pig",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "duck",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "duck",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was squeaked at do?",
              "answer": "oinked at the parrot",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "duck",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the duck's action?",
              "answer": "the dolphin mimicking the pig which led to the pig squeaking at the duck",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "duck",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the duck's involvement?",
              "answer": "the parrot dabbled peacefully",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "duck",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 24
      },
      {
        "id": "complexity_3_sentence_12",
        "sentence": "The octopus that the pig that the skunk that the elephant squeezed trumpeted at sprayed at oinked.",
        "structure": [
          {
            "subject": "octopus",
            "action": "oinked",
            "object": null
          },
          {
            "subject": "pig",
            "action": "sprayed at",
            "object": "octopus"
          },
          {
            "subject": "skunk",
            "action": "trumpeted at",
            "object": "pig"
          },
          {
            "subject": "elephant",
            "action": "squeezed",
            "object": "skunk"
          }
        ],
        "middle_entity": "pig",
        "all_entities": [
          "elephant",
          "skunk",
          "octopus",
          "pig"
        ],
        "questions_by_entity": {
          "elephant": [
            {
              "question": "What did the elephant do?",
              "answer": "squeeze the skunk",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "elephant",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the elephant?",
              "answer": "the skunk",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "elephant",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "elephant",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the elephant do?",
              "answer": "trumpeted at the pig",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "elephant",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the elephant's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "elephant",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the elephant's involvement?",
              "answer": "the skunk trumpeted at the pig",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "elephant",
              "is_middle_entity": false
            }
          ],
          "skunk": [
            {
              "question": "What did the skunk do?",
              "answer": "trumpet at the pig",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "skunk",
              "is_middle_entity": false
            },
            {
              "question": "What squeezed the skunk?",
              "answer": "the elephant",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "skunk",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "skunk",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was squeezed do?",
              "answer": "trumpeted at the pig",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "skunk",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the skunk's action?",
              "answer": "the elephant squeezing the skunk",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "skunk",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the skunk's involvement?",
              "answer": "the pig sprayed at the octopus",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "skunk",
              "is_middle_entity": false
            }
          ],
          "octopus": [
            {
              "question": "What did the octopus do?",
              "answer": "oink",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "octopus",
              "is_middle_entity": false
            },
            {
              "question": "What sprayed at the octopus?",
              "answer": "the pig",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "octopus",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "octopus",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was sprayed at do?",
              "answer": "oinked",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "octopus",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the octopus's action?",
              "answer": "the elephant squeezing the skunk which led to the skunk trumpeting at the pig which led to the pig spraying at the octopus",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "octopus",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the octopus's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "octopus",
              "is_middle_entity": false
            }
          ],
          "pig": [
            {
              "question": "What did the pig do?",
              "answer": "spray at the octopus",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "pig",
              "is_middle_entity": true
            },
            {
              "question": "What trumpeted at the pig?",
              "answer": "the skunk",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "pig",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "pig",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was trumpeted at do?",
              "answer": "sprayed at the octopus",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "pig",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the pig's action?",
              "answer": "the elephant squeezing the skunk which led to the skunk trumpeting at the pig",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "pig",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the pig's involvement?",
              "answer": "the octopus oinked",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "pig",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 24
      },
      {
        "id": "complexity_3_sentence_13",
        "sentence": "The nurse that the teacher that the photographer that the judge administered shots to ruled against shot taught.",
        "structure": [
          {
            "subject": "nurse",
            "action": "taught",
            "object": null
          },
          {
            "subject": "teacher",
            "action": "shot",
            "object": "nurse"
          },
          {
            "subject": "photographer",
            "action": "ruled against",
            "object": "teacher"
          },
          {
            "subject": "judge",
            "action": "administered shots to",
            "object": "photographer"
          }
        ],
        "middle_entity": "teacher",
        "all_entities": [
          "nurse",
          "judge",
          "photographer",
          "teacher"
        ],
        "questions_by_entity": {
          "nurse": [
            {
              "question": "What did the nurse do?",
              "answer": "teach",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "Who shot the nurse?",
              "answer": "the teacher",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was shot do?",
              "answer": "taught",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the nurse's action?",
              "answer": "the judge administering shots to the photographer which led to the photographer ruling against the teacher which led to the teacher shooting the nurse",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the nurse's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "nurse",
              "is_middle_entity": false
            }
          ],
          "judge": [
            {
              "question": "What did the judge do?",
              "answer": "administer shots to the photographer",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "Who was affected by the judge?",
              "answer": "the photographer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the judge do?",
              "answer": "ruled against the teacher",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the judge's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the judge's involvement?",
              "answer": "the photographer ruled against the teacher",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "judge",
              "is_middle_entity": false
            }
          ],
          "photographer": [
            {
              "question": "What did the photographer do?",
              "answer": "rule against the teacher",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "Who administered shots to the photographer?",
              "answer": "the judge",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was administered shots do?",
              "answer": "ruled against the teacher",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the photographer's action?",
              "answer": "the judge administering shots to the photographer",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the photographer's involvement?",
              "answer": "the teacher shot the nurse",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "photographer",
              "is_middle_entity": false
            }
          ],
          "teacher": [
            {
              "question": "What did the teacher do?",
              "answer": "shoot the nurse",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "teacher",
              "is_middle_entity": true
            },
            {
              "question": "Who ruled against the teacher?",
              "answer": "the photographer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "teacher",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "teacher",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was ruled against do?",
              "answer": "shot the nurse",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "teacher",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the teacher's action?",
              "answer": "the judge administering shots to the photographer which led to the photographer ruling against the teacher",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "teacher",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the teacher's involvement?",
              "answer": "the nurse taught",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "teacher",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 24
      },
      {
        "id": "complexity_3_sentence_14",
        "sentence": "The principal that the mailman that the firefighter that the police officer expelled arrested rescued sorted mail.",
        "structure": [
          {
            "subject": "principal",
            "action": "sorted mail",
            "object": null
          },
          {
            "subject": "mailman",
            "action": "rescued",
            "object": "principal"
          },
          {
            "subject": "firefighter",
            "action": "arrested",
            "object": "mailman"
          },
          {
            "subject": "police officer",
            "action": "expelled",
            "object": "firefighter"
          }
        ],
        "middle_entity": "mailman",
        "all_entities": [
          "principal",
          "mailman",
          "firefighter",
          "police officer"
        ],
        "questions_by_entity": {
          "principal": [
            {
              "question": "What did the principal do?",
              "answer": "sort mail",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "Who rescued the principal?",
              "answer": "the mailman",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was rescued do?",
              "answer": "sorted mail",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the principal's action?",
              "answer": "the police officer expelling the firefighter which led to the firefighter arresting the mailman which led to the mailman rescuing the principal",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the principal's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "principal",
              "is_middle_entity": false
            }
          ],
          "mailman": [
            {
              "question": "What did the mailman do?",
              "answer": "rescue the principal",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "mailman",
              "is_middle_entity": true
            },
            {
              "question": "Who arrested the mailman?",
              "answer": "the firefighter",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "mailman",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "mailman",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was arrested do?",
              "answer": "rescued the principal",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "mailman",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the mailman's action?",
              "answer": "the police officer expelling the firefighter which led to the firefighter arresting the mailman",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "mailman",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the mailman's involvement?",
              "answer": "the principal sorted mail",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "mailman",
              "is_middle_entity": true
            }
          ],
          "firefighter": [
            {
              "question": "What did the firefighter do?",
              "answer": "arrest the mailman",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "Who expelled the firefighter?",
              "answer": "the police officer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was expelled do?",
              "answer": "arrested the mailman",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the firefighter's action?",
              "answer": "the police officer expelling the firefighter",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the firefighter's involvement?",
              "answer": "the mailman rescued the principal",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "firefighter",
              "is_middle_entity": false
            }
          ],
          "police officer": [
            {
              "question": "What did the police officer do?",
              "answer": "expel the firefighter",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "Who was affected by the police officer?",
              "answer": "the firefighter",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the police officer do?",
              "answer": "arrested the mailman",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the police officer's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the police officer's involvement?",
              "answer": "the firefighter arrested the mailman",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "police officer",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 24
      },
      {
        "id": "complexity_3_sentence_15",
        "sentence": "The butterfly that the frog that the camel that the horse fluttered toward galloped toward spat at hopped.",
        "structure": [
          {
            "subject": "butterfly",
            "action": "hopped",
            "object": null
          },
          {
            "subject": "frog",
            "action": "spat at",
            "object": "butterfly"
          },
          {
            "subject": "camel",
            "action": "galloped toward",
            "object": "frog"
          },
          {
            "subject": "horse",
            "action": "fluttered toward",
            "object": "camel"
          }
        ],
        "middle_entity": "frog",
        "all_entities": [
          "camel",
          "frog",
          "butterfly",
          "horse"
        ],
        "questions_by_entity": {
          "camel": [
            {
              "question": "What did the camel do?",
              "answer": "gallop toward the frog",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "camel",
              "is_middle_entity": false
            },
            {
              "question": "What fluttered toward the camel?",
              "answer": "the horse",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "camel",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "camel",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was fluttered toward do?",
              "answer": "galloped toward the frog",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "camel",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the camel's action?",
              "answer": "the horse fluttering toward the camel",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "camel",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the camel's involvement?",
              "answer": "the frog spat at the butterfly",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "camel",
              "is_middle_entity": false
            }
          ],
          "frog": [
            {
              "question": "What did the frog do?",
              "answer": "spit at the butterfly",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "frog",
              "is_middle_entity": true
            },
            {
              "question": "What galloped toward the frog?",
              "answer": "the camel",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "frog",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "frog",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was galloped toward do?",
              "answer": "spat at the butterfly",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "frog",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the frog's action?",
              "answer": "the horse fluttering toward the camel which led to the camel galloping toward the frog",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "frog",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the frog's involvement?",
              "answer": "the butterfly hopped",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "frog",
              "is_middle_entity": true
            }
          ],
          "butterfly": [
            {
              "question": "What did the butterfly do?",
              "answer": "hop",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "butterfly",
              "is_middle_entity": false
            },
            {
              "question": "What spat at the butterfly?",
              "answer": "the frog",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "butterfly",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "butterfly",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was spat at do?",
              "answer": "hopped",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "butterfly",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the butterfly's action?",
              "answer": "the horse fluttering toward the camel which led to the camel galloping toward the frog which led to the frog spitting at the butterfly",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "butterfly",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the butterfly's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "butterfly",
              "is_middle_entity": false
            }
          ],
          "horse": [
            {
              "question": "What did the horse do?",
              "answer": "flutter toward the camel",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "horse",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the horse?",
              "answer": "the camel",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "horse",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "horse",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the horse do?",
              "answer": "galloped toward the frog",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "horse",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the horse's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "horse",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the horse's involvement?",
              "answer": "the camel galloped toward the frog",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "horse",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 24
      },
      {
        "id": "complexity_3_sentence_16",
        "sentence": "The truck that the spaceship that the bicycle that the train jackknifed into whistled at pedaled past orbited.",
        "structure": [
          {
            "subject": "truck",
            "action": "orbited",
            "object": null
          },
          {
            "subject": "spaceship",
            "action": "pedaled past",
            "object": "truck"
          },
          {
            "subject": "bicycle",
            "action": "whistled at",
            "object": "spaceship"
          },
          {
            "subject": "train",
            "action": "jackknifed into",
            "object": "bicycle"
          }
        ],
        "middle_entity": "spaceship",
        "all_entities": [
          "train",
          "bicycle",
          "spaceship",
          "truck"
        ],
        "questions_by_entity": {
          "train": [
            {
              "question": "What did the train do?",
              "answer": "jackknife into the bicycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the train?",
              "answer": "the bicycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the train do?",
              "answer": "whistled at the spaceship",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the train's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the train's involvement?",
              "answer": "the bicycle whistled at the spaceship",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            }
          ],
          "bicycle": [
            {
              "question": "What did the bicycle do?",
              "answer": "whistle at the spaceship",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What jackknifed into the bicycle?",
              "answer": "the train",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was jackknifed into do?",
              "answer": "whistled at the spaceship",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the bicycle's action?",
              "answer": "the train jackknifing into the bicycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the bicycle's involvement?",
              "answer": "the spaceship pedaled past the truck",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": false
            }
          ],
          "spaceship": [
            {
              "question": "What did the spaceship do?",
              "answer": "pedal past the truck",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": true
            },
            {
              "question": "What whistled at the spaceship?",
              "answer": "the bicycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was whistled at do?",
              "answer": "pedaled past the truck",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the spaceship's action?",
              "answer": "the train jackknifing into the bicycle which led to the bicycle whistling at the spaceship",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the spaceship's involvement?",
              "answer": "the truck orbited",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": true
            }
          ],
          "truck": [
            {
              "question": "What did the truck do?",
              "answer": "orbit",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What pedaled past the truck?",
              "answer": "the spaceship",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was pedaled past do?",
              "answer": "orbited",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the truck's action?",
              "answer": "the train jackknifing into the bicycle which led to the bicycle whistling at the spaceship which led to the spaceship pedaling past the truck",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the truck's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 24
      },
      {
        "id": "complexity_3_sentence_17",
        "sentence": "The cat that the frog that the elephant that the lion meowed at roared at charged at croaked.",
        "structure": [
          {
            "subject": "cat",
            "action": "croaked",
            "object": null
          },
          {
            "subject": "frog",
            "action": "charged at",
            "object": "cat"
          },
          {
            "subject": "elephant",
            "action": "roared at",
            "object": "frog"
          },
          {
            "subject": "lion",
            "action": "meowed at",
            "object": "elephant"
          }
        ],
        "middle_entity": "frog",
        "all_entities": [
          "elephant",
          "frog",
          "lion",
          "cat"
        ],
        "questions_by_entity": {
          "elephant": [
            {
              "question": "What did the elephant do?",
              "answer": "roar at the frog",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "elephant",
              "is_middle_entity": false
            },
            {
              "question": "What meowed at the elephant?",
              "answer": "the lion",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "elephant",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "elephant",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was meowed at do?",
              "answer": "roared at the frog",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "elephant",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the elephant's action?",
              "answer": "the lion meowing at the elephant",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "elephant",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the elephant's involvement?",
              "answer": "the frog charged at the cat",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "elephant",
              "is_middle_entity": false
            }
          ],
          "frog": [
            {
              "question": "What did the frog do?",
              "answer": "charge at the cat",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "frog",
              "is_middle_entity": true
            },
            {
              "question": "What roared at the frog?",
              "answer": "the elephant",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "frog",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "frog",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was roared at do?",
              "answer": "charged at the cat",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "frog",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the frog's action?",
              "answer": "the lion meowing at the elephant which led to the elephant roaring at the frog",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "frog",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the frog's involvement?",
              "answer": "the cat croaked",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "frog",
              "is_middle_entity": true
            }
          ],
          "lion": [
            {
              "question": "What did the lion do?",
              "answer": "meow at the elephant",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "lion",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the lion?",
              "answer": "the elephant",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "lion",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "lion",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the lion do?",
              "answer": "roared at the frog",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "lion",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the lion's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "lion",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the lion's involvement?",
              "answer": "the elephant roared at the frog",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "lion",
              "is_middle_entity": false
            }
          ],
          "cat": [
            {
              "question": "What did the cat do?",
              "answer": "croak",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "cat",
              "is_middle_entity": false
            },
            {
              "question": "What charged at the cat?",
              "answer": "the frog",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "cat",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "cat",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was charged at do?",
              "answer": "croaked",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "cat",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the cat's action?",
              "answer": "the lion meowing at the elephant which led to the elephant roaring at the frog which led to the frog charging at the cat",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "cat",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the cat's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "cat",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 24
      },
      {
        "id": "complexity_3_sentence_18",
        "sentence": "The beaver that the vulture that the seagull that the grasshopper gnawed at hopped toward dive-bombed scavenged.",
        "structure": [
          {
            "subject": "beaver",
            "action": "scavenged",
            "object": null
          },
          {
            "subject": "vulture",
            "action": "dive-bombed",
            "object": "beaver"
          },
          {
            "subject": "seagull",
            "action": "hopped toward",
            "object": "vulture"
          },
          {
            "subject": "grasshopper",
            "action": "gnawed at",
            "object": "seagull"
          }
        ],
        "middle_entity": "vulture",
        "all_entities": [
          "grasshopper",
          "beaver",
          "vulture",
          "seagull"
        ],
        "questions_by_entity": {
          "grasshopper": [
            {
              "question": "What did the grasshopper do?",
              "answer": "gnaw at the seagull",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "grasshopper",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the grasshopper?",
              "answer": "the seagull",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "grasshopper",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "grasshopper",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the grasshopper do?",
              "answer": "hopped toward the vulture",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "grasshopper",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the grasshopper's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "grasshopper",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the grasshopper's involvement?",
              "answer": "the seagull hopped toward the vulture",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "grasshopper",
              "is_middle_entity": false
            }
          ],
          "beaver": [
            {
              "question": "What did the beaver do?",
              "answer": "scavenge",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "beaver",
              "is_middle_entity": false
            },
            {
              "question": "What dive-bombed the beaver?",
              "answer": "the vulture",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "beaver",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "beaver",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was dive-bombed do?",
              "answer": "scavenged",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "beaver",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the beaver's action?",
              "answer": "the grasshopper gnawing at the seagull which led to the seagull hopping toward the vulture which led to the vulture dive-bombing the beaver",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "beaver",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the beaver's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "beaver",
              "is_middle_entity": false
            }
          ],
          "vulture": [
            {
              "question": "What did the vulture do?",
              "answer": "dive-bomb the beaver",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "vulture",
              "is_middle_entity": true
            },
            {
              "question": "What hopped toward the vulture?",
              "answer": "the seagull",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "vulture",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "vulture",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was hopped toward do?",
              "answer": "dive-bombed the beaver",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "vulture",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the vulture's action?",
              "answer": "the grasshopper gnawing at the seagull which led to the seagull hopping toward the vulture",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "vulture",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the vulture's involvement?",
              "answer": "the beaver scavenged",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "vulture",
              "is_middle_entity": true
            }
          ],
          "seagull": [
            {
              "question": "What did the seagull do?",
              "answer": "hop toward the vulture",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "seagull",
              "is_middle_entity": false
            },
            {
              "question": "What gnawed at the seagull?",
              "answer": "the grasshopper",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "seagull",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "seagull",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was gnawed at do?",
              "answer": "hopped toward the vulture",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "seagull",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the seagull's action?",
              "answer": "the grasshopper gnawing at the seagull",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "seagull",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the seagull's involvement?",
              "answer": "the vulture dive-bombed the beaver",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "seagull",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 24
      },
      {
        "id": "complexity_3_sentence_19",
        "sentence": "The bicycle that the airplane that the truck that the train pedaled past whistled at jackknifed into taxied.",
        "structure": [
          {
            "subject": "bicycle",
            "action": "taxied",
            "object": null
          },
          {
            "subject": "airplane",
            "action": "jackknifed into",
            "object": "bicycle"
          },
          {
            "subject": "truck",
            "action": "whistled at",
            "object": "airplane"
          },
          {
            "subject": "train",
            "action": "pedaled past",
            "object": "truck"
          }
        ],
        "middle_entity": "airplane",
        "all_entities": [
          "airplane",
          "train",
          "bicycle",
          "truck"
        ],
        "questions_by_entity": {
          "airplane": [
            {
              "question": "What did the airplane do?",
              "answer": "jackknife into the bicycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": true
            },
            {
              "question": "What whistled at the airplane?",
              "answer": "the truck",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was whistled at do?",
              "answer": "jackknifed into the bicycle",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the airplane's action?",
              "answer": "the train pedaling past the truck which led to the truck whistling at the airplane",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the airplane's involvement?",
              "answer": "the bicycle taxied",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": true
            }
          ],
          "train": [
            {
              "question": "What did the train do?",
              "answer": "pedal past the truck",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the train?",
              "answer": "the truck",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the train do?",
              "answer": "whistled at the airplane",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the train's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the train's involvement?",
              "answer": "the truck whistled at the airplane",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            }
          ],
          "bicycle": [
            {
              "question": "What did the bicycle do?",
              "answer": "taxi",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What jackknifed into the bicycle?",
              "answer": "the airplane",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was jackknifed into do?",
              "answer": "taxied",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the bicycle's action?",
              "answer": "the train pedaling past the truck which led to the truck whistling at the airplane which led to the airplane jackknifing into the bicycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the bicycle's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": false
            }
          ],
          "truck": [
            {
              "question": "What did the truck do?",
              "answer": "whistle at the airplane",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What pedaled past the truck?",
              "answer": "the train",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was pedaled past do?",
              "answer": "whistled at the airplane",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the truck's action?",
              "answer": "the train pedaling past the truck",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the truck's involvement?",
              "answer": "the airplane jackknifed into the bicycle",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 24
      },
      {
        "id": "complexity_3_sentence_20",
        "sentence": "The train that the bicycle that the airplane that the ambulance whistled at blared the siren at strafed pedaled.",
        "structure": [
          {
            "subject": "train",
            "action": "pedaled",
            "object": null
          },
          {
            "subject": "bicycle",
            "action": "strafed",
            "object": "train"
          },
          {
            "subject": "airplane",
            "action": "blared the siren at",
            "object": "bicycle"
          },
          {
            "subject": "ambulance",
            "action": "whistled at",
            "object": "airplane"
          }
        ],
        "middle_entity": "bicycle",
        "all_entities": [
          "airplane",
          "train",
          "ambulance",
          "bicycle"
        ],
        "questions_by_entity": {
          "airplane": [
            {
              "question": "What did the airplane do?",
              "answer": "siren at the bicycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What whistled at the airplane?",
              "answer": "the ambulance",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was whistled at do?",
              "answer": "blared the siren at the bicycle",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the airplane's action?",
              "answer": "the ambulance whistling at the airplane",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the airplane's involvement?",
              "answer": "the bicycle strafed the train",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            }
          ],
          "train": [
            {
              "question": "What did the train do?",
              "answer": "pedal",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What strafed the train?",
              "answer": "the bicycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was strafed do?",
              "answer": "pedaled",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the train's action?",
              "answer": "the ambulance whistling at the airplane which led to the airplane blaring the siren at the bicycle which led to the bicycle strafing the train",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the train's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            }
          ],
          "ambulance": [
            {
              "question": "What did the ambulance do?",
              "answer": "whistle at the airplane",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the ambulance?",
              "answer": "the airplane",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the ambulance do?",
              "answer": "blared the siren at the bicycle",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the ambulance's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the ambulance's involvement?",
              "answer": "the airplane blared the siren at the bicycle",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": false
            }
          ],
          "bicycle": [
            {
              "question": "What did the bicycle do?",
              "answer": "strafe the train",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": true
            },
            {
              "question": "What blared the siren at the bicycle?",
              "answer": "the airplane",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was blared the siren at do?",
              "answer": "strafed the train",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the bicycle's action?",
              "answer": "the ambulance whistling at the airplane which led to the airplane blaring the siren at the bicycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the bicycle's involvement?",
              "answer": "the train pedaled",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 24
      },
      {
        "id": "complexity_3_sentence_21",
        "sentence": "The firefighter that the lawyer that the teacher that the nurse carried out administered shots to graded argued.",
        "structure": [
          {
            "subject": "firefighter",
            "action": "argued",
            "object": null
          },
          {
            "subject": "lawyer",
            "action": "graded",
            "object": "firefighter"
          },
          {
            "subject": "teacher",
            "action": "administered shots to",
            "object": "lawyer"
          },
          {
            "subject": "nurse",
            "action": "carried out",
            "object": "teacher"
          }
        ],
        "middle_entity": "lawyer",
        "all_entities": [
          "nurse",
          "firefighter",
          "lawyer",
          "teacher"
        ],
        "questions_by_entity": {
          "nurse": [
            {
              "question": "What did the nurse do?",
              "answer": "carry out the teacher",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "Who was affected by the nurse?",
              "answer": "the teacher",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the nurse do?",
              "answer": "administered shots to the lawyer",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the nurse's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the nurse's involvement?",
              "answer": "the teacher administered shots to the lawyer",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "nurse",
              "is_middle_entity": false
            }
          ],
          "firefighter": [
            {
              "question": "What did the firefighter do?",
              "answer": "argue",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "Who graded the firefighter?",
              "answer": "the lawyer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was graded do?",
              "answer": "argued",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the firefighter's action?",
              "answer": "the nurse carrying the teacher out which led to the teacher administering shots to the lawyer which led to the lawyer grading the firefighter",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the firefighter's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "firefighter",
              "is_middle_entity": false
            }
          ],
          "lawyer": [
            {
              "question": "What did the lawyer do?",
              "answer": "grade the firefighter",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "lawyer",
              "is_middle_entity": true
            },
            {
              "question": "Who administered shots to the lawyer?",
              "answer": "the teacher",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "lawyer",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "lawyer",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was administered shots do?",
              "answer": "graded the firefighter",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "lawyer",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the lawyer's action?",
              "answer": "the nurse carrying the teacher out which led to the teacher administering shots to the lawyer",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "lawyer",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the lawyer's involvement?",
              "answer": "the firefighter argued",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "lawyer",
              "is_middle_entity": true
            }
          ],
          "teacher": [
            {
              "question": "What did the teacher do?",
              "answer": "administer shots to the lawyer",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "Who carried out the teacher?",
              "answer": "the nurse",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was carried out do?",
              "answer": "administered shots to the lawyer",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the teacher's action?",
              "answer": "the nurse carrying out the teacher",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the teacher's involvement?",
              "answer": "the lawyer graded the firefighter",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "teacher",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 24
      },
      {
        "id": "complexity_3_sentence_22",
        "sentence": "The train that the truck that the boat that the ambulance whistled at blared the siren at moored to jackknifed.",
        "structure": [
          {
            "subject": "train",
            "action": "jackknifed",
            "object": null
          },
          {
            "subject": "truck",
            "action": "moored to",
            "object": "train"
          },
          {
            "subject": "boat",
            "action": "blared the siren at",
            "object": "truck"
          },
          {
            "subject": "ambulance",
            "action": "whistled at",
            "object": "boat"
          }
        ],
        "middle_entity": "truck",
        "all_entities": [
          "train",
          "ambulance",
          "boat",
          "truck"
        ],
        "questions_by_entity": {
          "train": [
            {
              "question": "What did the train do?",
              "answer": "jackknife",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What moored to the train?",
              "answer": "the truck",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was moored do?",
              "answer": "jackknifed",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the train's action?",
              "answer": "the ambulance whistling at the boat which led to the boat blaring the siren at the truck which led to the truck mooring to the train",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the train's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            }
          ],
          "ambulance": [
            {
              "question": "What did the ambulance do?",
              "answer": "whistle at the boat",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the ambulance?",
              "answer": "the boat",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the ambulance do?",
              "answer": "blared the siren at the truck",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the ambulance's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the ambulance's involvement?",
              "answer": "the boat blared the siren at the truck",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": false
            }
          ],
          "boat": [
            {
              "question": "What did the boat do?",
              "answer": "siren at the truck",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What whistled at the boat?",
              "answer": "the ambulance",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was whistled at do?",
              "answer": "blared the siren at the truck",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the boat's action?",
              "answer": "the ambulance whistling at the boat",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the boat's involvement?",
              "answer": "the truck moored to the train",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            }
          ],
          "truck": [
            {
              "question": "What did the truck do?",
              "answer": "moor to the train",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": true
            },
            {
              "question": "What blared the siren at the truck?",
              "answer": "the boat",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was blared the siren at do?",
              "answer": "moored to the train",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the truck's action?",
              "answer": "the ambulance whistling at the boat which led to the boat blaring the siren at the truck",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the truck's involvement?",
              "answer": "the train jackknifed",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 24
      },
      {
        "id": "complexity_3_sentence_23",
        "sentence": "The duck that the cockroach that the deer that the squirrel paddled toward chittered at leaped at scuttled.",
        "structure": [
          {
            "subject": "duck",
            "action": "scuttled",
            "object": null
          },
          {
            "subject": "cockroach",
            "action": "leaped at",
            "object": "duck"
          },
          {
            "subject": "deer",
            "action": "chittered at",
            "object": "cockroach"
          },
          {
            "subject": "squirrel",
            "action": "paddled toward",
            "object": "deer"
          }
        ],
        "middle_entity": "cockroach",
        "all_entities": [
          "deer",
          "squirrel",
          "duck",
          "cockroach"
        ],
        "questions_by_entity": {
          "deer": [
            {
              "question": "What did the deer do?",
              "answer": "chitter at the cockroach",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "deer",
              "is_middle_entity": false
            },
            {
              "question": "What paddled toward the deer?",
              "answer": "the squirrel",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "deer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "deer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was paddled toward do?",
              "answer": "chittered at the cockroach",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "deer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the deer's action?",
              "answer": "the squirrel paddling toward the deer",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "deer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the deer's involvement?",
              "answer": "the cockroach leaped at the duck",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "deer",
              "is_middle_entity": false
            }
          ],
          "squirrel": [
            {
              "question": "What did the squirrel do?",
              "answer": "paddle toward the deer",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "squirrel",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the squirrel?",
              "answer": "the deer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "squirrel",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "squirrel",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the squirrel do?",
              "answer": "chittered at the cockroach",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "squirrel",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the squirrel's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "squirrel",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the squirrel's involvement?",
              "answer": "the deer chittered at the cockroach",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "squirrel",
              "is_middle_entity": false
            }
          ],
          "duck": [
            {
              "question": "What did the duck do?",
              "answer": "scuttle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "duck",
              "is_middle_entity": false
            },
            {
              "question": "What leaped at the duck?",
              "answer": "the cockroach",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "duck",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "duck",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was leaped at do?",
              "answer": "scuttled",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "duck",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the duck's action?",
              "answer": "the squirrel paddling toward the deer which led to the deer chittering at the cockroach which led to the cockroach leaping at the duck",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "duck",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the duck's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "duck",
              "is_middle_entity": false
            }
          ],
          "cockroach": [
            {
              "question": "What did the cockroach do?",
              "answer": "leap at the duck",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "cockroach",
              "is_middle_entity": true
            },
            {
              "question": "What chittered at the cockroach?",
              "answer": "the deer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "cockroach",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "cockroach",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was chittered at do?",
              "answer": "leaped at the duck",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "cockroach",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the cockroach's action?",
              "answer": "the squirrel paddling toward the deer which led to the deer chittering at the cockroach",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "cockroach",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the cockroach's involvement?",
              "answer": "the duck scuttled",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "cockroach",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 24
      },
      {
        "id": "complexity_3_sentence_24",
        "sentence": "The vulture that the frog that the sheep that the deer scavenged from leaped at bleated at croaked.",
        "structure": [
          {
            "subject": "vulture",
            "action": "croaked",
            "object": null
          },
          {
            "subject": "frog",
            "action": "bleated at",
            "object": "vulture"
          },
          {
            "subject": "sheep",
            "action": "leaped at",
            "object": "frog"
          },
          {
            "subject": "deer",
            "action": "scavenged from",
            "object": "sheep"
          }
        ],
        "middle_entity": "frog",
        "all_entities": [
          "sheep",
          "frog",
          "vulture",
          "deer"
        ],
        "questions_by_entity": {
          "sheep": [
            {
              "question": "What did the sheep do?",
              "answer": "leap at the frog",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "sheep",
              "is_middle_entity": false
            },
            {
              "question": "What scavenged from the sheep?",
              "answer": "the deer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "sheep",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "sheep",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was scavenged from do?",
              "answer": "leaped at the frog",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "sheep",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the sheep's action?",
              "answer": "the deer scavenging from the sheep",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "sheep",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the sheep's involvement?",
              "answer": "the frog bleated at the vulture",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "sheep",
              "is_middle_entity": false
            }
          ],
          "frog": [
            {
              "question": "What did the frog do?",
              "answer": "bleat at the vulture",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "frog",
              "is_middle_entity": true
            },
            {
              "question": "What leaped at the frog?",
              "answer": "the sheep",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "frog",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "frog",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was leaped at do?",
              "answer": "bleated at the vulture",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "frog",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the frog's action?",
              "answer": "the deer scavenging from the sheep which led to the sheep leaping at the frog",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "frog",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the frog's involvement?",
              "answer": "the vulture croaked",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "frog",
              "is_middle_entity": true
            }
          ],
          "vulture": [
            {
              "question": "What did the vulture do?",
              "answer": "croak",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "vulture",
              "is_middle_entity": false
            },
            {
              "question": "What bleated at the vulture?",
              "answer": "the frog",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "vulture",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "vulture",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was bleated at do?",
              "answer": "croaked",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "vulture",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the vulture's action?",
              "answer": "the deer scavenging from the sheep which led to the sheep leaping at the frog which led to the frog bleating at the vulture",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "vulture",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the vulture's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "vulture",
              "is_middle_entity": false
            }
          ],
          "deer": [
            {
              "question": "What did the deer do?",
              "answer": "scavenge from the sheep",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "deer",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the deer?",
              "answer": "the sheep",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "deer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "deer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the deer do?",
              "answer": "leaped at the frog",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "deer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the deer's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "deer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the deer's involvement?",
              "answer": "the sheep leaped at the frog",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "deer",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 24
      },
      {
        "id": "complexity_3_sentence_25",
        "sentence": "The spaceship that the motorcycle that the bicycle that the airplane orbited strafed pedaled past wheelied.",
        "structure": [
          {
            "subject": "spaceship",
            "action": "wheelied",
            "object": null
          },
          {
            "subject": "motorcycle",
            "action": "pedaled past",
            "object": "spaceship"
          },
          {
            "subject": "bicycle",
            "action": "strafed",
            "object": "motorcycle"
          },
          {
            "subject": "airplane",
            "action": "orbited",
            "object": "bicycle"
          }
        ],
        "middle_entity": "motorcycle",
        "all_entities": [
          "motorcycle",
          "bicycle",
          "airplane",
          "spaceship"
        ],
        "questions_by_entity": {
          "motorcycle": [
            {
              "question": "What did the motorcycle do?",
              "answer": "pedal past the spaceship",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "What strafed the motorcycle?",
              "answer": "the bicycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was strafed do?",
              "answer": "pedaled past the spaceship",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the motorcycle's action?",
              "answer": "the airplane orbiting the bicycle which led to the bicycle strafing the motorcycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the motorcycle's involvement?",
              "answer": "the spaceship wheelied",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": true
            }
          ],
          "bicycle": [
            {
              "question": "What did the bicycle do?",
              "answer": "strafe the motorcycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What orbited the bicycle?",
              "answer": "the airplane",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was orbited do?",
              "answer": "strafed the motorcycle",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the bicycle's action?",
              "answer": "the airplane orbiting the bicycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the bicycle's involvement?",
              "answer": "the motorcycle pedaled past the spaceship",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": false
            }
          ],
          "airplane": [
            {
              "question": "What did the airplane do?",
              "answer": "orbit the bicycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the airplane?",
              "answer": "the bicycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the airplane do?",
              "answer": "strafed the motorcycle",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the airplane's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the airplane's involvement?",
              "answer": "the bicycle strafed the motorcycle",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            }
          ],
          "spaceship": [
            {
              "question": "What did the spaceship do?",
              "answer": "wheelie",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What pedaled past the spaceship?",
              "answer": "the motorcycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was pedaled past do?",
              "answer": "wheelied",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the spaceship's action?",
              "answer": "the airplane orbiting the bicycle which led to the bicycle strafing the motorcycle which led to the motorcycle pedaling past the spaceship",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the spaceship's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 24
      },
      {
        "id": "complexity_3_sentence_26",
        "sentence": "The motorcycle that the truck that the spaceship that the bicycle lane-split past rang the bell at orbited jackknifed.",
        "structure": [
          {
            "subject": "motorcycle",
            "action": "jackknifed",
            "object": null
          },
          {
            "subject": "truck",
            "action": "orbited",
            "object": "motorcycle"
          },
          {
            "subject": "spaceship",
            "action": "rang the bell at",
            "object": "truck"
          },
          {
            "subject": "bicycle",
            "action": "lane-split past",
            "object": "spaceship"
          }
        ],
        "middle_entity": "truck",
        "all_entities": [
          "bicycle",
          "spaceship",
          "motorcycle",
          "truck"
        ],
        "questions_by_entity": {
          "bicycle": [
            {
              "question": "What did the bicycle do?",
              "answer": "lane-split past the spaceship",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the bicycle?",
              "answer": "the spaceship",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the bicycle do?",
              "answer": "rang the bell at the truck",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the bicycle's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the bicycle's involvement?",
              "answer": "the spaceship rang the bell at the truck",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": false
            }
          ],
          "spaceship": [
            {
              "question": "What did the spaceship do?",
              "answer": "ring the bell at the truck",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What lane-split past the spaceship?",
              "answer": "the bicycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was lane-split past do?",
              "answer": "rang the bell at the truck",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the spaceship's action?",
              "answer": "the bicycle lane-splitting past the spaceship",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the spaceship's involvement?",
              "answer": "the truck orbited the motorcycle",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            }
          ],
          "motorcycle": [
            {
              "question": "What did the motorcycle do?",
              "answer": "jackknife",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What orbited the motorcycle?",
              "answer": "the truck",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was orbited do?",
              "answer": "jackknifed",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the motorcycle's action?",
              "answer": "the bicycle lane-splitting past the spaceship which led to the spaceship ringing the bell at the truck which led to the truck orbiting the motorcycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the motorcycle's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": false
            }
          ],
          "truck": [
            {
              "question": "What did the truck do?",
              "answer": "orbit the motorcycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": true
            },
            {
              "question": "What rang the bell at the truck?",
              "answer": "the spaceship",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was ranged do?",
              "answer": "orbited the motorcycle",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the truck's action?",
              "answer": "the bicycle lane-splitting past the spaceship which led to the spaceship ringing the bell at the truck",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the truck's involvement?",
              "answer": "the motorcycle jackknifed",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 24
      },
      {
        "id": "complexity_3_sentence_27",
        "sentence": "The boat that the motorcycle that the truck that the airplane anchored near strafed towed wheelied.",
        "structure": [
          {
            "subject": "boat",
            "action": "wheelied",
            "object": null
          },
          {
            "subject": "motorcycle",
            "action": "towed",
            "object": "boat"
          },
          {
            "subject": "truck",
            "action": "strafed",
            "object": "motorcycle"
          },
          {
            "subject": "airplane",
            "action": "anchored near",
            "object": "truck"
          }
        ],
        "middle_entity": "motorcycle",
        "all_entities": [
          "airplane",
          "boat",
          "motorcycle",
          "truck"
        ],
        "questions_by_entity": {
          "airplane": [
            {
              "question": "What did the airplane do?",
              "answer": "anchor near the truck",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the airplane?",
              "answer": "the truck",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the airplane do?",
              "answer": "strafed the motorcycle",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the airplane's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the airplane's involvement?",
              "answer": "the truck strafed the motorcycle",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            }
          ],
          "boat": [
            {
              "question": "What did the boat do?",
              "answer": "wheelie",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What towed the boat?",
              "answer": "the motorcycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was towed do?",
              "answer": "wheelied",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the boat's action?",
              "answer": "the airplane anchoring near the truck which led to the truck strafing the motorcycle which led to the motorcycle towing the boat",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the boat's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            }
          ],
          "motorcycle": [
            {
              "question": "What did the motorcycle do?",
              "answer": "tow the boat",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "What strafed the motorcycle?",
              "answer": "the truck",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was strafed do?",
              "answer": "towed the boat",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the motorcycle's action?",
              "answer": "the airplane anchoring near the truck which led to the truck strafing the motorcycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the motorcycle's involvement?",
              "answer": "the boat wheelied",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": true
            }
          ],
          "truck": [
            {
              "question": "What did the truck do?",
              "answer": "strafe the motorcycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What anchored near the truck?",
              "answer": "the airplane",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was anchored near do?",
              "answer": "strafed the motorcycle",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the truck's action?",
              "answer": "the airplane anchoring near the truck",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the truck's involvement?",
              "answer": "the motorcycle towed the boat",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 24
      },
      {
        "id": "complexity_3_sentence_28",
        "sentence": "The giraffe that the tuna that the bee that the cobra stretched toward reared at stung jumped.",
        "structure": [
          {
            "subject": "giraffe",
            "action": "jumped",
            "object": null
          },
          {
            "subject": "tuna",
            "action": "stung",
            "object": "giraffe"
          },
          {
            "subject": "bee",
            "action": "reared at",
            "object": "tuna"
          },
          {
            "subject": "cobra",
            "action": "stretched toward",
            "object": "bee"
          }
        ],
        "middle_entity": "tuna",
        "all_entities": [
          "tuna",
          "giraffe",
          "cobra",
          "bee"
        ],
        "questions_by_entity": {
          "tuna": [
            {
              "question": "What did the tuna do?",
              "answer": "sting the giraffe",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "tuna",
              "is_middle_entity": true
            },
            {
              "question": "What reared at the tuna?",
              "answer": "the bee",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "tuna",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "tuna",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was reared at do?",
              "answer": "stung the giraffe",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "tuna",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the tuna's action?",
              "answer": "the cobra stretching toward the bee which led to the bee rearing at the tuna",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "tuna",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the tuna's involvement?",
              "answer": "the giraffe jumped",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "tuna",
              "is_middle_entity": true
            }
          ],
          "giraffe": [
            {
              "question": "What did the giraffe do?",
              "answer": "jump",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "giraffe",
              "is_middle_entity": false
            },
            {
              "question": "What stung the giraffe?",
              "answer": "the tuna",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "giraffe",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "giraffe",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was stung do?",
              "answer": "jumped",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "giraffe",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the giraffe's action?",
              "answer": "the cobra stretching toward the bee which led to the bee rearing at the tuna which led to the tuna stinging the giraffe",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "giraffe",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the giraffe's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "giraffe",
              "is_middle_entity": false
            }
          ],
          "cobra": [
            {
              "question": "What did the cobra do?",
              "answer": "stretch toward the bee",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "cobra",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the cobra?",
              "answer": "the bee",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "cobra",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "cobra",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the cobra do?",
              "answer": "reared at the tuna",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "cobra",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the cobra's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "cobra",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the cobra's involvement?",
              "answer": "the bee reared at the tuna",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "cobra",
              "is_middle_entity": false
            }
          ],
          "bee": [
            {
              "question": "What did the bee do?",
              "answer": "rear at the tuna",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "bee",
              "is_middle_entity": false
            },
            {
              "question": "What stretched toward the bee?",
              "answer": "the cobra",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "bee",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "bee",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was stretched toward do?",
              "answer": "reared at the tuna",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "bee",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the bee's action?",
              "answer": "the cobra stretching toward the bee",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "bee",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the bee's involvement?",
              "answer": "the tuna stung the giraffe",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "bee",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 24
      },
      {
        "id": "complexity_3_sentence_29",
        "sentence": "The waiter that the doctor that the teacher that the photographer seated shot assigned homework to diagnosed.",
        "structure": [
          {
            "subject": "waiter",
            "action": "diagnosed",
            "object": null
          },
          {
            "subject": "doctor",
            "action": "assigned homework to",
            "object": "waiter"
          },
          {
            "subject": "teacher",
            "action": "shot",
            "object": "doctor"
          },
          {
            "subject": "photographer",
            "action": "seated",
            "object": "teacher"
          }
        ],
        "middle_entity": "doctor",
        "all_entities": [
          "waiter",
          "doctor",
          "photographer",
          "teacher"
        ],
        "questions_by_entity": {
          "waiter": [
            {
              "question": "What did the waiter do?",
              "answer": "diagnose",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "Who assigned homework to the waiter?",
              "answer": "the doctor",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was assigned homework do?",
              "answer": "diagnosed",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the waiter's action?",
              "answer": "the photographer seating the teacher which led to the teacher shooting the doctor which led to the doctor assigning homework to the waiter",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the waiter's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "waiter",
              "is_middle_entity": false
            }
          ],
          "doctor": [
            {
              "question": "What did the doctor do?",
              "answer": "assign homework to the waiter",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "doctor",
              "is_middle_entity": true
            },
            {
              "question": "Who shot the doctor?",
              "answer": "the teacher",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "doctor",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "doctor",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was shot do?",
              "answer": "assigned homework to the waiter",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "doctor",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the doctor's action?",
              "answer": "the photographer seating the teacher which led to the teacher shooting the doctor",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "doctor",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the doctor's involvement?",
              "answer": "the waiter diagnosed",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "doctor",
              "is_middle_entity": true
            }
          ],
          "photographer": [
            {
              "question": "What did the photographer do?",
              "answer": "seat the teacher",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "Who was affected by the photographer?",
              "answer": "the teacher",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the photographer do?",
              "answer": "shot the doctor",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the photographer's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the photographer's involvement?",
              "answer": "the teacher shot the doctor",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "photographer",
              "is_middle_entity": false
            }
          ],
          "teacher": [
            {
              "question": "What did the teacher do?",
              "answer": "shoot the doctor",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "Who seated the teacher?",
              "answer": "the photographer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was seated do?",
              "answer": "shot the doctor",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the teacher's action?",
              "answer": "the photographer seating the teacher",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the teacher's involvement?",
              "answer": "the doctor assigned homework to the waiter",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "teacher",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 24
      },
      {
        "id": "complexity_3_sentence_30",
        "sentence": "The giraffe that the moose that the cat that the duck stretched toward paddled toward purred at bellowed.",
        "structure": [
          {
            "subject": "giraffe",
            "action": "bellowed",
            "object": null
          },
          {
            "subject": "moose",
            "action": "purred at",
            "object": "giraffe"
          },
          {
            "subject": "cat",
            "action": "paddled toward",
            "object": "moose"
          },
          {
            "subject": "duck",
            "action": "stretched toward",
            "object": "cat"
          }
        ],
        "middle_entity": "moose",
        "all_entities": [
          "duck",
          "giraffe",
          "moose",
          "cat"
        ],
        "questions_by_entity": {
          "duck": [
            {
              "question": "What did the duck do?",
              "answer": "stretch toward the cat",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "duck",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the duck?",
              "answer": "the cat",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "duck",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "duck",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the duck do?",
              "answer": "paddled toward the moose",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "duck",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the duck's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "duck",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the duck's involvement?",
              "answer": "the cat paddled toward the moose",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "duck",
              "is_middle_entity": false
            }
          ],
          "giraffe": [
            {
              "question": "What did the giraffe do?",
              "answer": "bellow",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "giraffe",
              "is_middle_entity": false
            },
            {
              "question": "What purred at the giraffe?",
              "answer": "the moose",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "giraffe",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "giraffe",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was purred at do?",
              "answer": "bellowed",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "giraffe",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the giraffe's action?",
              "answer": "the duck stretching toward the cat which led to the cat paddling toward the moose which led to the moose purring at the giraffe",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "giraffe",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the giraffe's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "giraffe",
              "is_middle_entity": false
            }
          ],
          "moose": [
            {
              "question": "What did the moose do?",
              "answer": "purr at the giraffe",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "moose",
              "is_middle_entity": true
            },
            {
              "question": "What paddled toward the moose?",
              "answer": "the cat",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "moose",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "moose",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was paddled toward do?",
              "answer": "purred at the giraffe",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "moose",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the moose's action?",
              "answer": "the duck stretching toward the cat which led to the cat paddling toward the moose",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "moose",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the moose's involvement?",
              "answer": "the giraffe bellowed",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "moose",
              "is_middle_entity": true
            }
          ],
          "cat": [
            {
              "question": "What did the cat do?",
              "answer": "paddle toward the moose",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "cat",
              "is_middle_entity": false
            },
            {
              "question": "What stretched toward the cat?",
              "answer": "the duck",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "cat",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "4",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "cat",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was stretched toward do?",
              "answer": "paddled toward the moose",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "cat",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the cat's action?",
              "answer": "the duck stretching toward the cat",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "cat",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the cat's involvement?",
              "answer": "the moose purred at the giraffe",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "cat",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 24
      }
    ],
    "total_questions": 720,
    "entities_processed": 120,
    "middle_entities_flagged": 30
  },
  "complexity_4": {
    "sentences": [
      {
        "id": "complexity_4_sentence_1",
        "sentence": "The waiter that the mailman that the teacher that the police officer that the photographer seated photographed read rights to lectured to delivered mail.",
        "structure": [
          {
            "subject": "waiter",
            "action": "delivered mail",
            "object": null
          },
          {
            "subject": "mailman",
            "action": "lectured to",
            "object": "waiter"
          },
          {
            "subject": "teacher",
            "action": "read rights to",
            "object": "mailman"
          },
          {
            "subject": "police officer",
            "action": "photographed",
            "object": "teacher"
          },
          {
            "subject": "photographer",
            "action": "seated",
            "object": "police officer"
          }
        ],
        "middle_entity": "teacher",
        "all_entities": [
          "mailman",
          "teacher",
          "police officer",
          "waiter",
          "photographer"
        ],
        "questions_by_entity": {
          "mailman": [
            {
              "question": "What did the mailman do?",
              "answer": "lecture to the waiter",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "Who read rights to the mailman?",
              "answer": "the teacher",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was read rights do?",
              "answer": "lectured to the waiter",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the mailman's action?",
              "answer": "the photographer seating the police officer which led to the police officer photographing the teacher which led to the teacher reading rights to the mailman",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the mailman's involvement?",
              "answer": "the waiter delivered mail",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "mailman",
              "is_middle_entity": false
            }
          ],
          "teacher": [
            {
              "question": "What did the teacher do?",
              "answer": "read rights to the mailman",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "teacher",
              "is_middle_entity": true
            },
            {
              "question": "Who photographed the teacher?",
              "answer": "the police officer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "teacher",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "teacher",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was photographed do?",
              "answer": "read rights to the mailman",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "teacher",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the teacher's action?",
              "answer": "the photographer seating the police officer which led to the police officer photographing the teacher",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "teacher",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the teacher's involvement?",
              "answer": "the mailman lectured to the waiter",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "teacher",
              "is_middle_entity": true
            }
          ],
          "police officer": [
            {
              "question": "What did the police officer do?",
              "answer": "photograph the teacher",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "Who seated the police officer?",
              "answer": "the photographer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was seated do?",
              "answer": "photographed the teacher",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the police officer's action?",
              "answer": "the photographer seating the police officer",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the police officer's involvement?",
              "answer": "the teacher read rights to the mailman",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "police officer",
              "is_middle_entity": false
            }
          ],
          "waiter": [
            {
              "question": "What did the waiter do?",
              "answer": "deliver mail",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "Who lectured to the waiter?",
              "answer": "the mailman",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was lectured do?",
              "answer": "delivered mail",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the waiter's action?",
              "answer": "the photographer seating the police officer which led to the police officer photographing the teacher which led to the teacher reading rights to the mailman which led to the mailman lecturing to the waiter",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the waiter's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "waiter",
              "is_middle_entity": false
            }
          ],
          "photographer": [
            {
              "question": "What did the photographer do?",
              "answer": "seat the police officer",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "Who was affected by the photographer?",
              "answer": "the police officer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the photographer do?",
              "answer": "photographed the teacher",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the photographer's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the photographer's involvement?",
              "answer": "the police officer photographed the teacher",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "photographer",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 30
      },
      {
        "id": "complexity_4_sentence_2",
        "sentence": "The truck that the airplane that the boat that the ambulance that the train towed whistled at blared the siren at anchored near taxied.",
        "structure": [
          {
            "subject": "truck",
            "action": "taxied",
            "object": null
          },
          {
            "subject": "airplane",
            "action": "anchored near",
            "object": "truck"
          },
          {
            "subject": "boat",
            "action": "blared the siren at",
            "object": "airplane"
          },
          {
            "subject": "ambulance",
            "action": "whistled at",
            "object": "boat"
          },
          {
            "subject": "train",
            "action": "towed",
            "object": "ambulance"
          }
        ],
        "middle_entity": "boat",
        "all_entities": [
          "airplane",
          "ambulance",
          "train",
          "boat",
          "truck"
        ],
        "questions_by_entity": {
          "airplane": [
            {
              "question": "What did the airplane do?",
              "answer": "anchor near the truck",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What blared the siren at the airplane?",
              "answer": "the boat",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was blared the siren at do?",
              "answer": "anchored near the truck",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the airplane's action?",
              "answer": "the train towing the ambulance which led to the ambulance whistling at the boat which led to the boat blaring the siren at the airplane",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the airplane's involvement?",
              "answer": "the truck taxied",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            }
          ],
          "ambulance": [
            {
              "question": "What did the ambulance do?",
              "answer": "whistle at the boat",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What towed the ambulance?",
              "answer": "the train",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was towed do?",
              "answer": "whistled at the boat",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the ambulance's action?",
              "answer": "the train towing the ambulance",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the ambulance's involvement?",
              "answer": "the boat blared the siren at the airplane",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": false
            }
          ],
          "train": [
            {
              "question": "What did the train do?",
              "answer": "tow the ambulance",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the train?",
              "answer": "the ambulance",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the train do?",
              "answer": "whistled at the boat",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the train's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the train's involvement?",
              "answer": "the ambulance whistled at the boat",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            }
          ],
          "boat": [
            {
              "question": "What did the boat do?",
              "answer": "siren at the airplane",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": true
            },
            {
              "question": "What whistled at the boat?",
              "answer": "the ambulance",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was whistled at do?",
              "answer": "blared the siren at the airplane",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the boat's action?",
              "answer": "the train towing the ambulance which led to the ambulance whistling at the boat",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the boat's involvement?",
              "answer": "the airplane anchored near the truck",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": true
            }
          ],
          "truck": [
            {
              "question": "What did the truck do?",
              "answer": "taxi",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What anchored near the truck?",
              "answer": "the airplane",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was anchored near do?",
              "answer": "taxied",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the truck's action?",
              "answer": "the train towing the ambulance which led to the ambulance whistling at the boat which led to the boat blaring the siren at the airplane which led to the airplane anchoring near the truck",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the truck's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 30
      },
      {
        "id": "complexity_4_sentence_3",
        "sentence": "The police officer that the teacher that the mailman that the nurse that the photographer handcuffed photographed bandaged delivered mail to lectured.",
        "structure": [
          {
            "subject": "police officer",
            "action": "lectured",
            "object": null
          },
          {
            "subject": "teacher",
            "action": "delivered mail to",
            "object": "police officer"
          },
          {
            "subject": "mailman",
            "action": "bandaged",
            "object": "teacher"
          },
          {
            "subject": "nurse",
            "action": "photographed",
            "object": "mailman"
          },
          {
            "subject": "photographer",
            "action": "handcuffed",
            "object": "nurse"
          }
        ],
        "middle_entity": "mailman",
        "all_entities": [
          "mailman",
          "teacher",
          "police officer",
          "photographer",
          "nurse"
        ],
        "questions_by_entity": {
          "mailman": [
            {
              "question": "What did the mailman do?",
              "answer": "bandage the teacher",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "mailman",
              "is_middle_entity": true
            },
            {
              "question": "Who photographed the mailman?",
              "answer": "the nurse",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "mailman",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "mailman",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was photographed do?",
              "answer": "bandaged the teacher",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "mailman",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the mailman's action?",
              "answer": "the photographer handcuffing the nurse which led to the nurse photographing the mailman",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "mailman",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the mailman's involvement?",
              "answer": "the teacher delivered mail to the police officer",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "mailman",
              "is_middle_entity": true
            }
          ],
          "teacher": [
            {
              "question": "What did the teacher do?",
              "answer": "deliver mail to the police officer",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "Who bandaged the teacher?",
              "answer": "the mailman",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was bandaged do?",
              "answer": "delivered mail to the police officer",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the teacher's action?",
              "answer": "the photographer handcuffing the nurse which led to the nurse photographing the mailman which led to the mailman bandaging the teacher",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the teacher's involvement?",
              "answer": "the police officer lectured",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "teacher",
              "is_middle_entity": false
            }
          ],
          "police officer": [
            {
              "question": "What did the police officer do?",
              "answer": "lecture",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "Who delivered mail to the police officer?",
              "answer": "the teacher",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was delivered mail do?",
              "answer": "lectured",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the police officer's action?",
              "answer": "the photographer handcuffing the nurse which led to the nurse photographing the mailman which led to the mailman bandaging the teacher which led to the teacher delivering mail to the police officer",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the police officer's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "police officer",
              "is_middle_entity": false
            }
          ],
          "photographer": [
            {
              "question": "What did the photographer do?",
              "answer": "handcuff the nurse",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "Who was affected by the photographer?",
              "answer": "the nurse",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the photographer do?",
              "answer": "photographed the mailman",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the photographer's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the photographer's involvement?",
              "answer": "the nurse photographed the mailman",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "photographer",
              "is_middle_entity": false
            }
          ],
          "nurse": [
            {
              "question": "What did the nurse do?",
              "answer": "photograph the mailman",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "Who handcuffed the nurse?",
              "answer": "the photographer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was handcuffed do?",
              "answer": "photographed the mailman",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the nurse's action?",
              "answer": "the photographer handcuffing the nurse",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the nurse's involvement?",
              "answer": "the mailman bandaged the teacher",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "nurse",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 30
      },
      {
        "id": "complexity_4_sentence_4",
        "sentence": "The bicycle that the ambulance that the boat that the spaceship that the airplane pedaled past air-dropped on orbited moored to blared the siren.",
        "structure": [
          {
            "subject": "bicycle",
            "action": "blared the siren",
            "object": null
          },
          {
            "subject": "ambulance",
            "action": "moored to",
            "object": "bicycle"
          },
          {
            "subject": "boat",
            "action": "orbited",
            "object": "ambulance"
          },
          {
            "subject": "spaceship",
            "action": "air-dropped on",
            "object": "boat"
          },
          {
            "subject": "airplane",
            "action": "pedaled past",
            "object": "spaceship"
          }
        ],
        "middle_entity": "boat",
        "all_entities": [
          "airplane",
          "ambulance",
          "boat",
          "bicycle",
          "spaceship"
        ],
        "questions_by_entity": {
          "airplane": [
            {
              "question": "What did the airplane do?",
              "answer": "pedal past the spaceship",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the airplane?",
              "answer": "the spaceship",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the airplane do?",
              "answer": "air-dropped on the boat",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the airplane's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the airplane's involvement?",
              "answer": "the spaceship air-dropped on the boat",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            }
          ],
          "ambulance": [
            {
              "question": "What did the ambulance do?",
              "answer": "moor to the bicycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What orbited the ambulance?",
              "answer": "the boat",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was orbited do?",
              "answer": "moored to the bicycle",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the ambulance's action?",
              "answer": "the airplane pedaling past the spaceship which led to the spaceship air-dropping on the boat which led to the boat orbiting the ambulance",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the ambulance's involvement?",
              "answer": "the bicycle blared the siren",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": false
            }
          ],
          "boat": [
            {
              "question": "What did the boat do?",
              "answer": "orbit the ambulance",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": true
            },
            {
              "question": "What air-dropped on the boat?",
              "answer": "the spaceship",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was air-dropped on do?",
              "answer": "orbited the ambulance",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the boat's action?",
              "answer": "the airplane pedaling past the spaceship which led to the spaceship air-dropping on the boat",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the boat's involvement?",
              "answer": "the ambulance moored to the bicycle",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": true
            }
          ],
          "bicycle": [
            {
              "question": "What did the bicycle do?",
              "answer": "siren",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What moored to the bicycle?",
              "answer": "the ambulance",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was moored do?",
              "answer": "blared the siren",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the bicycle's action?",
              "answer": "the airplane pedaling past the spaceship which led to the spaceship air-dropping on the boat which led to the boat orbiting the ambulance which led to the ambulance mooring to the bicycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the bicycle's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": false
            }
          ],
          "spaceship": [
            {
              "question": "What did the spaceship do?",
              "answer": "air-drop on the boat",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What pedaled past the spaceship?",
              "answer": "the airplane",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was pedaled past do?",
              "answer": "air-dropped on the boat",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the spaceship's action?",
              "answer": "the airplane pedaling past the spaceship",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the spaceship's involvement?",
              "answer": "the boat orbited the ambulance",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 30
      },
      {
        "id": "complexity_4_sentence_5",
        "sentence": "The whale that the dolphin that the dog that the skunk that the deer spouted at bounded toward sprayed at barked at clicked.",
        "structure": [
          {
            "subject": "whale",
            "action": "clicked",
            "object": null
          },
          {
            "subject": "dolphin",
            "action": "barked at",
            "object": "whale"
          },
          {
            "subject": "dog",
            "action": "sprayed at",
            "object": "dolphin"
          },
          {
            "subject": "skunk",
            "action": "bounded toward",
            "object": "dog"
          },
          {
            "subject": "deer",
            "action": "spouted at",
            "object": "skunk"
          }
        ],
        "middle_entity": "dog",
        "all_entities": [
          "dog",
          "deer",
          "skunk",
          "dolphin",
          "whale"
        ],
        "questions_by_entity": {
          "dog": [
            {
              "question": "What did the dog do?",
              "answer": "spray at the dolphin",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "dog",
              "is_middle_entity": true
            },
            {
              "question": "What bounded toward the dog?",
              "answer": "the skunk",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "dog",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "dog",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was bounded toward do?",
              "answer": "sprayed at the dolphin",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "dog",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the dog's action?",
              "answer": "the deer spouting at the skunk which led to the skunk bounding toward the dog",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "dog",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the dog's involvement?",
              "answer": "the dolphin barked at the whale",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "dog",
              "is_middle_entity": true
            }
          ],
          "deer": [
            {
              "question": "What did the deer do?",
              "answer": "spout at the skunk",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "deer",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the deer?",
              "answer": "the skunk",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "deer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "deer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the deer do?",
              "answer": "bounded toward the dog",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "deer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the deer's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "deer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the deer's involvement?",
              "answer": "the skunk bounded toward the dog",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "deer",
              "is_middle_entity": false
            }
          ],
          "skunk": [
            {
              "question": "What did the skunk do?",
              "answer": "bound toward the dog",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "skunk",
              "is_middle_entity": false
            },
            {
              "question": "What spouted at the skunk?",
              "answer": "the deer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "skunk",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "skunk",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was spouted at do?",
              "answer": "bounded toward the dog",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "skunk",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the skunk's action?",
              "answer": "the deer spouting at the skunk",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "skunk",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the skunk's involvement?",
              "answer": "the dog sprayed at the dolphin",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "skunk",
              "is_middle_entity": false
            }
          ],
          "dolphin": [
            {
              "question": "What did the dolphin do?",
              "answer": "bark at the whale",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "dolphin",
              "is_middle_entity": false
            },
            {
              "question": "What sprayed at the dolphin?",
              "answer": "the dog",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "dolphin",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "dolphin",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was sprayed at do?",
              "answer": "barked at the whale",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "dolphin",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the dolphin's action?",
              "answer": "the deer spouting at the skunk which led to the skunk bounding toward the dog which led to the dog spraying at the dolphin",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "dolphin",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the dolphin's involvement?",
              "answer": "the whale clicked",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "dolphin",
              "is_middle_entity": false
            }
          ],
          "whale": [
            {
              "question": "What did the whale do?",
              "answer": "click",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "whale",
              "is_middle_entity": false
            },
            {
              "question": "What barked at the whale?",
              "answer": "the dolphin",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "whale",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "whale",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was barked at do?",
              "answer": "clicked",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "whale",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the whale's action?",
              "answer": "the deer spouting at the skunk which led to the skunk bounding toward the dog which led to the dog spraying at the dolphin which led to the dolphin barking at the whale",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "whale",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the whale's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "whale",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 30
      },
      {
        "id": "complexity_4_sentence_6",
        "sentence": "The boat that the train that the truck that the spaceship that the bicycle sailed past pedaled past orbited towed whistled.",
        "structure": [
          {
            "subject": "boat",
            "action": "whistled",
            "object": null
          },
          {
            "subject": "train",
            "action": "towed",
            "object": "boat"
          },
          {
            "subject": "truck",
            "action": "orbited",
            "object": "train"
          },
          {
            "subject": "spaceship",
            "action": "pedaled past",
            "object": "truck"
          },
          {
            "subject": "bicycle",
            "action": "sailed past",
            "object": "spaceship"
          }
        ],
        "middle_entity": "truck",
        "all_entities": [
          "train",
          "boat",
          "bicycle",
          "spaceship",
          "truck"
        ],
        "questions_by_entity": {
          "train": [
            {
              "question": "What did the train do?",
              "answer": "tow the boat",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What orbited the train?",
              "answer": "the truck",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was orbited do?",
              "answer": "towed the boat",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the train's action?",
              "answer": "the bicycle sailing past the spaceship which led to the spaceship pedaling past the truck which led to the truck orbiting the train",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the train's involvement?",
              "answer": "the boat whistled",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            }
          ],
          "boat": [
            {
              "question": "What did the boat do?",
              "answer": "whistle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What towed the boat?",
              "answer": "the train",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was towed do?",
              "answer": "whistled",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the boat's action?",
              "answer": "the bicycle sailing past the spaceship which led to the spaceship pedaling past the truck which led to the truck orbiting the train which led to the train towing the boat",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the boat's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            }
          ],
          "bicycle": [
            {
              "question": "What did the bicycle do?",
              "answer": "sail past the spaceship",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the bicycle?",
              "answer": "the spaceship",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the bicycle do?",
              "answer": "pedaled past the truck",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the bicycle's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the bicycle's involvement?",
              "answer": "the spaceship pedaled past the truck",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": false
            }
          ],
          "spaceship": [
            {
              "question": "What did the spaceship do?",
              "answer": "pedal past the truck",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What sailed past the spaceship?",
              "answer": "the bicycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was sailed past do?",
              "answer": "pedaled past the truck",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the spaceship's action?",
              "answer": "the bicycle sailing past the spaceship",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the spaceship's involvement?",
              "answer": "the truck orbited the train",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            }
          ],
          "truck": [
            {
              "question": "What did the truck do?",
              "answer": "orbit the train",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": true
            },
            {
              "question": "What pedaled past the truck?",
              "answer": "the spaceship",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was pedaled past do?",
              "answer": "orbited the train",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the truck's action?",
              "answer": "the bicycle sailing past the spaceship which led to the spaceship pedaling past the truck",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the truck's involvement?",
              "answer": "the train towed the boat",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 30
      },
      {
        "id": "complexity_4_sentence_7",
        "sentence": "The bicycle that the truck that the ambulance that the motorcycle that the train rang the bell at whistled at lane-split past blared the siren at jackknifed.",
        "structure": [
          {
            "subject": "bicycle",
            "action": "jackknifed",
            "object": null
          },
          {
            "subject": "truck",
            "action": "blared the siren at",
            "object": "bicycle"
          },
          {
            "subject": "ambulance",
            "action": "lane-split past",
            "object": "truck"
          },
          {
            "subject": "motorcycle",
            "action": "whistled at",
            "object": "ambulance"
          },
          {
            "subject": "train",
            "action": "rang the bell at",
            "object": "motorcycle"
          }
        ],
        "middle_entity": "ambulance",
        "all_entities": [
          "ambulance",
          "train",
          "bicycle",
          "motorcycle",
          "truck"
        ],
        "questions_by_entity": {
          "ambulance": [
            {
              "question": "What did the ambulance do?",
              "answer": "lane-split past the truck",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": true
            },
            {
              "question": "What whistled at the ambulance?",
              "answer": "the motorcycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was whistled at do?",
              "answer": "lane-split past the truck",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the ambulance's action?",
              "answer": "the train ringing the bell at the motorcycle which led to the motorcycle whistling at the ambulance",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the ambulance's involvement?",
              "answer": "the truck blared the siren at the bicycle",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": true
            }
          ],
          "train": [
            {
              "question": "What did the train do?",
              "answer": "ring the bell at the motorcycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the train?",
              "answer": "the motorcycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the train do?",
              "answer": "whistled at the ambulance",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the train's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the train's involvement?",
              "answer": "the motorcycle whistled at the ambulance",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            }
          ],
          "bicycle": [
            {
              "question": "What did the bicycle do?",
              "answer": "jackknife",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What blared the siren at the bicycle?",
              "answer": "the truck",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was blared the siren at do?",
              "answer": "jackknifed",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the bicycle's action?",
              "answer": "the train ringing the bell at the motorcycle which led to the motorcycle whistling at the ambulance which led to the ambulance lane-splitting past the truck which led to the truck blaring the siren at the bicycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the bicycle's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": false
            }
          ],
          "motorcycle": [
            {
              "question": "What did the motorcycle do?",
              "answer": "whistle at the ambulance",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What rang the bell at the motorcycle?",
              "answer": "the train",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was ringed do?",
              "answer": "whistled at the ambulance",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the motorcycle's action?",
              "answer": "the train ringing the bell at the motorcycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the motorcycle's involvement?",
              "answer": "the ambulance lane-split past the truck",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": false
            }
          ],
          "truck": [
            {
              "question": "What did the truck do?",
              "answer": "siren at the bicycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What lane-split past the truck?",
              "answer": "the ambulance",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was lane-split past do?",
              "answer": "blared the siren at the bicycle",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the truck's action?",
              "answer": "the train ringing the bell at the motorcycle which led to the motorcycle whistling at the ambulance which led to the ambulance lane-splitting past the truck",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the truck's involvement?",
              "answer": "the bicycle jackknifed",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 30
      },
      {
        "id": "complexity_4_sentence_8",
        "sentence": "The firefighter that the nurse that the lawyer that the teacher that the police officer carried out handcuffed assigned homework to defended in court triaged.",
        "structure": [
          {
            "subject": "firefighter",
            "action": "triaged",
            "object": null
          },
          {
            "subject": "nurse",
            "action": "defended in court",
            "object": "firefighter"
          },
          {
            "subject": "lawyer",
            "action": "assigned homework to",
            "object": "nurse"
          },
          {
            "subject": "teacher",
            "action": "handcuffed",
            "object": "lawyer"
          },
          {
            "subject": "police officer",
            "action": "carried out",
            "object": "teacher"
          }
        ],
        "middle_entity": "lawyer",
        "all_entities": [
          "teacher",
          "lawyer",
          "police officer",
          "nurse",
          "firefighter"
        ],
        "questions_by_entity": {
          "teacher": [
            {
              "question": "What did the teacher do?",
              "answer": "handcuff the lawyer",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "Who carried the teacher out?",
              "answer": "the police officer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was carried out do?",
              "answer": "handcuffed the lawyer",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the teacher's action?",
              "answer": "the police officer carrying the teacher out ",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the teacher's involvement?",
              "answer": "the lawyer assigned homework to the nurse",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "teacher",
              "is_middle_entity": false
            }
          ],
          "lawyer": [
            {
              "question": "What did the lawyer do?",
              "answer": "assign homework to the nurse",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "lawyer",
              "is_middle_entity": true
            },
            {
              "question": "Who handcuffed the lawyer?",
              "answer": "the teacher",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "lawyer",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "lawyer",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was handcuffed do?",
              "answer": "assigned homework to the nurse",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "lawyer",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the lawyer's action?",
              "answer": "the police officer carrying the teacher out which led to the teacher handcuffing the lawyer",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "lawyer",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the lawyer's involvement?",
              "answer": "the nurse defended in court the firefighter",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "lawyer",
              "is_middle_entity": true
            }
          ],
          "police officer": [
            {
              "question": "What did the police officer do?",
              "answer": "carry the teacher out ",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "Who was affected by the police officer?",
              "answer": "the teacher",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the police officer do?",
              "answer": "handcuffed the lawyer",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the police officer's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the police officer's involvement?",
              "answer": "the teacher handcuffed the lawyer",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "police officer",
              "is_middle_entity": false
            }
          ],
          "nurse": [
            {
              "question": "What did the nurse do?",
              "answer": "defend the firefighter in court",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "Who assigned homework to the nurse?",
              "answer": "the lawyer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was assigned homework do?",
              "answer": "defended the firefighter in court ",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the nurse's action?",
              "answer": "the police officer carrying the teacher out which led to the teacher handcuffing the lawyer which led to the lawyer assigning homework to the nurse",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the nurse's involvement?",
              "answer": "the firefighter triaged",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "nurse",
              "is_middle_entity": false
            }
          ],
          "firefighter": [
            {
              "question": "What did the firefighter do?",
              "answer": "triage",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "Who defended the firefighter in court ?",
              "answer": "the nurse",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was defended in court do?",
              "answer": "triaged",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the firefighter's action?",
              "answer": "the police officer carrying the teacher out which led to the teacher handcuffing the lawyer which led to the lawyer assigning homework to the nurse which led to the nurse defending the firefighter in court ",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the firefighter's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "firefighter",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 30
      },
      {
        "id": "complexity_4_sentence_9",
        "sentence": "The judge that the surgeon that the waiter that the teacher that the photographer ruled against developed photos of assigned homework to seated sutured.",
        "structure": [
          {
            "subject": "judge",
            "action": "sutured",
            "object": null
          },
          {
            "subject": "surgeon",
            "action": "seated",
            "object": "judge"
          },
          {
            "subject": "waiter",
            "action": "assigned homework to",
            "object": "surgeon"
          },
          {
            "subject": "teacher",
            "action": "developed photos of",
            "object": "waiter"
          },
          {
            "subject": "photographer",
            "action": "ruled against",
            "object": "teacher"
          }
        ],
        "middle_entity": "waiter",
        "all_entities": [
          "teacher",
          "waiter",
          "judge",
          "photographer",
          "surgeon"
        ],
        "questions_by_entity": {
          "teacher": [
            {
              "question": "What did the teacher do?",
              "answer": "develop photos of the waiter",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "Who ruled against the teacher?",
              "answer": "the photographer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was ruled against do?",
              "answer": "developed photos of the waiter",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the teacher's action?",
              "answer": "the photographer ruling against the teacher",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the teacher's involvement?",
              "answer": "the waiter assigned homework to the surgeon",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "teacher",
              "is_middle_entity": false
            }
          ],
          "waiter": [
            {
              "question": "What did the waiter do?",
              "answer": "assign homework to the surgeon",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "waiter",
              "is_middle_entity": true
            },
            {
              "question": "Who developed photos of the waiter?",
              "answer": "the teacher",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "waiter",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "waiter",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that whose photos were developed do?",
              "answer": "assigned homework to the surgeon",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "waiter",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the waiter's action?",
              "answer": "the photographer ruling against the teacher which led to the teacher developing photos of the waiter",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "waiter",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the waiter's involvement?",
              "answer": "the surgeon seated the judge",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "waiter",
              "is_middle_entity": true
            }
          ],
          "judge": [
            {
              "question": "What did the judge do?",
              "answer": "suture",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "Who seated the judge?",
              "answer": "the surgeon",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was seated do?",
              "answer": "sutured",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the judge's action?",
              "answer": "the photographer ruling against the teacher which led to the teacher developing photos of the waiter which led to the waiter assigning homework to the surgeon which led to the surgeon seating the judge",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the judge's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "judge",
              "is_middle_entity": false
            }
          ],
          "photographer": [
            {
              "question": "What did the photographer do?",
              "answer": "rule against the teacher",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "Who was affected by the photographer?",
              "answer": "the teacher",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the photographer do?",
              "answer": "developed photos of the waiter",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the photographer's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the photographer's involvement?",
              "answer": "the teacher developed photos of the waiter",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "photographer",
              "is_middle_entity": false
            }
          ],
          "surgeon": [
            {
              "question": "What did the surgeon do?",
              "answer": "seat the judge",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "Who assigned homework to the surgeon?",
              "answer": "the waiter",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was assigned homework do?",
              "answer": "seated the judge",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the surgeon's action?",
              "answer": "the photographer ruling against the teacher which led to the teacher developing photos of the waiter which led to the waiter assigning homework to the surgeon",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the surgeon's involvement?",
              "answer": "the judge sutured",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "surgeon",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 30
      },
      {
        "id": "complexity_4_sentence_10",
        "sentence": "The cockroach that the crab that the cobra that the pig that the lion scuttled toward prowled toward snorted at reared at scuttled.",
        "structure": [
          {
            "subject": "cockroach",
            "action": "scuttled",
            "object": null
          },
          {
            "subject": "crab",
            "action": "reared at",
            "object": "cockroach"
          },
          {
            "subject": "cobra",
            "action": "snorted at",
            "object": "crab"
          },
          {
            "subject": "pig",
            "action": "prowled toward",
            "object": "cobra"
          },
          {
            "subject": "lion",
            "action": "scuttled toward",
            "object": "pig"
          }
        ],
        "middle_entity": "cobra",
        "all_entities": [
          "pig",
          "cobra",
          "cockroach",
          "crab",
          "lion"
        ],
        "questions_by_entity": {
          "pig": [
            {
              "question": "What did the pig do?",
              "answer": "prowl toward the cobra",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "pig",
              "is_middle_entity": false
            },
            {
              "question": "What scuttled toward the pig?",
              "answer": "the lion",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "pig",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "pig",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was scuttled toward do?",
              "answer": "prowled toward the cobra",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "pig",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the pig's action?",
              "answer": "the lion scuttling toward the pig",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "pig",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the pig's involvement?",
              "answer": "the cobra snorted at the crab",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "pig",
              "is_middle_entity": false
            }
          ],
          "cobra": [
            {
              "question": "What did the cobra do?",
              "answer": "snort at the crab",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "cobra",
              "is_middle_entity": true
            },
            {
              "question": "What prowled toward the cobra?",
              "answer": "the pig",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "cobra",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "cobra",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was prowled toward do?",
              "answer": "snorted at the crab",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "cobra",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the cobra's action?",
              "answer": "the lion scuttling toward the pig which led to the pig prowling toward the cobra",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "cobra",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the cobra's involvement?",
              "answer": "the crab reared at the cockroach",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "cobra",
              "is_middle_entity": true
            }
          ],
          "cockroach": [
            {
              "question": "What did the cockroach do?",
              "answer": "scuttle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "cockroach",
              "is_middle_entity": false
            },
            {
              "question": "What reared at the cockroach?",
              "answer": "the crab",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "cockroach",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "cockroach",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was reared at do?",
              "answer": "scuttled",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "cockroach",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the cockroach's action?",
              "answer": "the lion scuttling toward the pig which led to the pig prowling toward the cobra which led to the cobra snorting at the crab which led to the crab rearing at the cockroach",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "cockroach",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the cockroach's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "cockroach",
              "is_middle_entity": false
            }
          ],
          "crab": [
            {
              "question": "What did the crab do?",
              "answer": "rear at the cockroach",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "crab",
              "is_middle_entity": false
            },
            {
              "question": "What snorted at the crab?",
              "answer": "the cobra",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "crab",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "crab",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was snorted at do?",
              "answer": "reared at the cockroach",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "crab",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the crab's action?",
              "answer": "the lion scuttling toward the pig which led to the pig prowling toward the cobra which led to the cobra snorting at the crab",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "crab",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the crab's involvement?",
              "answer": "the cockroach scuttled",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "crab",
              "is_middle_entity": false
            }
          ],
          "lion": [
            {
              "question": "What did the lion do?",
              "answer": "scuttle toward the pig",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "lion",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the lion?",
              "answer": "the pig",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "lion",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "lion",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the lion do?",
              "answer": "prowled toward the cobra",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "lion",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the lion's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "lion",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the lion's involvement?",
              "answer": "the pig prowled toward the cobra",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "lion",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 30
      },
      {
        "id": "complexity_4_sentence_11",
        "sentence": "The butterfly that the octopus that the moose that the frog that the lion fluttered toward roared at hopped toward charged at inked.",
        "structure": [
          {
            "subject": "butterfly",
            "action": "oinked",
            "object": null
          },
          {
            "subject": "octopus",
            "action": "charged at",
            "object": "butterfly"
          },
          {
            "subject": "moose",
            "action": "hopped toward",
            "object": "octopus"
          },
          {
            "subject": "frog",
            "action": "roared at",
            "object": "moose"
          },
          {
            "subject": "lion",
            "action": "fluttered toward",
            "object": "frog"
          }
        ],
        "middle_entity": "moose",
        "all_entities": [
          "butterfly",
          "octopus",
          "frog",
          "lion",
          "moose"
        ],
        "questions_by_entity": {
          "butterfly": [
            {
              "question": "What did the butterfly do?",
              "answer": "oink",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "butterfly",
              "is_middle_entity": false
            },
            {
              "question": "What charged at the butterfly?",
              "answer": "the octopus",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "butterfly",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "butterfly",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was charged at do?",
              "answer": "oinked",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "butterfly",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the butterfly's action?",
              "answer": "the lion fluttering toward the frog which led to the frog roaring at the moose which led to the moose hopping toward the octopus which led to the octopus charging at the butterfly",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "butterfly",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the butterfly's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "butterfly",
              "is_middle_entity": false
            }
          ],
          "octopus": [
            {
              "question": "What did the octopus do?",
              "answer": "charge at the butterfly",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "octopus",
              "is_middle_entity": false
            },
            {
              "question": "What hopped toward the octopus?",
              "answer": "the moose",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "octopus",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "octopus",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was hopped toward do?",
              "answer": "charged at the butterfly",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "octopus",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the octopus's action?",
              "answer": "the lion fluttering toward the frog which led to the frog roaring at the moose which led to the moose hopping toward the octopus",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "octopus",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the octopus's involvement?",
              "answer": "the butterfly inked",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "octopus",
              "is_middle_entity": false
            }
          ],
          "frog": [
            {
              "question": "What did the frog do?",
              "answer": "roar at the moose",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "frog",
              "is_middle_entity": false
            },
            {
              "question": "What fluttered toward the frog?",
              "answer": "the lion",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "frog",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "frog",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was fluttered toward do?",
              "answer": "roared at the moose",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "frog",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the frog's action?",
              "answer": "the lion fluttering toward the frog",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "frog",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the frog's involvement?",
              "answer": "the moose hopped toward the octopus",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "frog",
              "is_middle_entity": false
            }
          ],
          "lion": [
            {
              "question": "What did the lion do?",
              "answer": "flutter toward the frog",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "lion",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the lion?",
              "answer": "the frog",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "lion",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "lion",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the lion do?",
              "answer": "roared at the moose",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "lion",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the lion's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "lion",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the lion's involvement?",
              "answer": "the frog roared at the moose",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "lion",
              "is_middle_entity": false
            }
          ],
          "moose": [
            {
              "question": "What did the moose do?",
              "answer": "hop toward the octopus",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "moose",
              "is_middle_entity": true
            },
            {
              "question": "What roared at the moose?",
              "answer": "the frog",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "moose",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "moose",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was roared at do?",
              "answer": "hopped toward the octopus",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "moose",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the moose's action?",
              "answer": "the lion fluttering toward the frog which led to the frog roaring at the moose",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "moose",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the moose's involvement?",
              "answer": "the octopus charged at the butterfly",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "moose",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 30
      },
      {
        "id": "complexity_4_sentence_12",
        "sentence": "The train that the truck that the spaceship that the motorcycle that the ambulance whistled at blared the siren at wheelied at orbited jackknifed.",
        "structure": [
          {
            "subject": "train",
            "action": "jackknifed",
            "object": null
          },
          {
            "subject": "truck",
            "action": "orbited",
            "object": "train"
          },
          {
            "subject": "spaceship",
            "action": "wheelied at",
            "object": "truck"
          },
          {
            "subject": "motorcycle",
            "action": "blared the siren at",
            "object": "spaceship"
          },
          {
            "subject": "ambulance",
            "action": "whistled at",
            "object": "motorcycle"
          }
        ],
        "middle_entity": "spaceship",
        "all_entities": [
          "ambulance",
          "train",
          "truck",
          "motorcycle",
          "spaceship"
        ],
        "questions_by_entity": {
          "ambulance": [
            {
              "question": "What did the ambulance do?",
              "answer": "whistle at the motorcycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the ambulance?",
              "answer": "the motorcycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the ambulance do?",
              "answer": "blared the siren at the spaceship",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the ambulance's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the ambulance's involvement?",
              "answer": "the motorcycle blared the siren at the spaceship",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": false
            }
          ],
          "train": [
            {
              "question": "What did the train do?",
              "answer": "jackknife",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What orbited the train?",
              "answer": "the truck",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was orbited do?",
              "answer": "jackknifed",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the train's action?",
              "answer": "the ambulance whistling at the motorcycle which led to the motorcycle blaring the siren at the spaceship which led to the spaceship doing a wheelie at the truck which led to the truck orbiting the train",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the train's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            }
          ],
          "truck": [
            {
              "question": "What did the truck do?",
              "answer": "orbit the train",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What wheelied at the truck?",
              "answer": "the spaceship",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was wheelied at do?",
              "answer": "orbited the train",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the truck's action?",
              "answer": "the ambulance whistling at the motorcycle which led to the motorcycle blaring the siren at the spaceship which led to the spaceship doing a wheelie at the truck",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the truck's involvement?",
              "answer": "the train jackknifed",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            }
          ],
          "motorcycle": [
            {
              "question": "What did the motorcycle do?",
              "answer": "siren at the spaceship",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What whistled at the motorcycle?",
              "answer": "the ambulance",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was whistled at do?",
              "answer": "blared the siren at the spaceship",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the motorcycle's action?",
              "answer": "the ambulance whistling at the motorcycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the motorcycle's involvement?",
              "answer": "the spaceship wheelied at the truck",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": false
            }
          ],
          "spaceship": [
            {
              "question": "What did the spaceship do?",
              "answer": "wheelie at the truck",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": true
            },
            {
              "question": "What blared the siren at the spaceship?",
              "answer": "the motorcycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was blared the siren at do?",
              "answer": "wheelied at the truck",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the spaceship's action?",
              "answer": "the ambulance whistling at the motorcycle which led to the motorcycle blaring the siren at the spaceship",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the spaceship's involvement?",
              "answer": "the truck orbited the train",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 30
      },
      {
        "id": "complexity_4_sentence_13",
        "sentence": "The spaceship that the boat that the motorcycle that the truck that the airplane orbited strafed towed wheelied at anchored.",
        "structure": [
          {
            "subject": "spaceship",
            "action": "anchored",
            "object": null
          },
          {
            "subject": "boat",
            "action": "wheelied at",
            "object": "spaceship"
          },
          {
            "subject": "motorcycle",
            "action": "towed",
            "object": "boat"
          },
          {
            "subject": "truck",
            "action": "strafed",
            "object": "motorcycle"
          },
          {
            "subject": "airplane",
            "action": "orbited",
            "object": "truck"
          }
        ],
        "middle_entity": "motorcycle",
        "all_entities": [
          "airplane",
          "boat",
          "truck",
          "motorcycle",
          "spaceship"
        ],
        "questions_by_entity": {
          "airplane": [
            {
              "question": "What did the airplane do?",
              "answer": "orbit the truck",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the airplane?",
              "answer": "the truck",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the airplane do?",
              "answer": "strafed the motorcycle",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the airplane's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the airplane's involvement?",
              "answer": "the truck strafed the motorcycle",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            }
          ],
          "boat": [
            {
              "question": "What did the boat do?",
              "answer": "wheelie at the spaceship",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What towed the boat?",
              "answer": "the motorcycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was towed do?",
              "answer": "wheelied at the spaceship",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the boat's action?",
              "answer": "the airplane orbiting the truck which led to the truck strafing the motorcycle which led to the motorcycle towing the boat",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the boat's involvement?",
              "answer": "the spaceship anchored",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            }
          ],
          "truck": [
            {
              "question": "What did the truck do?",
              "answer": "strafe the motorcycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What orbited the truck?",
              "answer": "the airplane",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was orbited do?",
              "answer": "strafed the motorcycle",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the truck's action?",
              "answer": "the airplane orbiting the truck",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the truck's involvement?",
              "answer": "the motorcycle towed the boat",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            }
          ],
          "motorcycle": [
            {
              "question": "What did the motorcycle do?",
              "answer": "tow the boat",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "What strafed the motorcycle?",
              "answer": "the truck",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was strafed do?",
              "answer": "towed the boat",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the motorcycle's action?",
              "answer": "the airplane orbiting the truck which led to the truck strafing the motorcycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the motorcycle's involvement?",
              "answer": "the boat wheelied at the spaceship",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": true
            }
          ],
          "spaceship": [
            {
              "question": "What did the spaceship do?",
              "answer": "anchor",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What wheelied at the spaceship?",
              "answer": "the boat",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was wheelied at do?",
              "answer": "anchored",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the spaceship's action?",
              "answer": "the airplane orbiting the truck which led to the truck strafing the motorcycle which led to the motorcycle towing the boat which led to the boat doing a wheelie at the spaceship",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the spaceship's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 30
      },
      {
        "id": "complexity_4_sentence_14",
        "sentence": "The heron that the whale that the spider that the bat that the worm speared wriggled toward echolocated crawled toward sang.",
        "structure": [
          {
            "subject": "heron",
            "action": "sang",
            "object": null
          },
          {
            "subject": "whale",
            "action": "crawled toward",
            "object": "heron"
          },
          {
            "subject": "spider",
            "action": "echolocated",
            "object": "whale"
          },
          {
            "subject": "bat",
            "action": "wriggled toward",
            "object": "spider"
          },
          {
            "subject": "worm",
            "action": "speared",
            "object": "bat"
          }
        ],
        "middle_entity": "spider",
        "all_entities": [
          "bat",
          "heron",
          "worm",
          "spider",
          "whale"
        ],
        "questions_by_entity": {
          "bat": [
            {
              "question": "What did the bat do?",
              "answer": "wriggle toward the spider",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "bat",
              "is_middle_entity": false
            },
            {
              "question": "What speared the bat?",
              "answer": "the worm",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "bat",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "bat",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was speared do?",
              "answer": "wriggled toward the spider",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "bat",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the bat's action?",
              "answer": "the worm spearing the bat",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "bat",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the bat's involvement?",
              "answer": "the spider echolocated the whale",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "bat",
              "is_middle_entity": false
            }
          ],
          "heron": [
            {
              "question": "What did the heron do?",
              "answer": "sing",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "heron",
              "is_middle_entity": false
            },
            {
              "question": "What crawled toward the heron?",
              "answer": "the whale",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "heron",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "heron",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was crawled toward do?",
              "answer": "sang",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "heron",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the heron's action?",
              "answer": "the worm spearing the bat which led to the bat wriggling toward the spider which led to the spider echolocating the whale which led to the whale crawling toward the heron",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "heron",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the heron's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "heron",
              "is_middle_entity": false
            }
          ],
          "worm": [
            {
              "question": "What did the worm do?",
              "answer": "spear the bat",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "worm",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the worm?",
              "answer": "the bat",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "worm",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "worm",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the worm do?",
              "answer": "wriggled toward the spider",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "worm",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the worm's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "worm",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the worm's involvement?",
              "answer": "the bat wriggled toward the spider",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "worm",
              "is_middle_entity": false
            }
          ],
          "spider": [
            {
              "question": "What did the spider do?",
              "answer": "echolocate the whale",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "spider",
              "is_middle_entity": true
            },
            {
              "question": "What wriggled toward the spider?",
              "answer": "the bat",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "spider",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "spider",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was wriggled toward do?",
              "answer": "echolocated the whale",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "spider",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the spider's action?",
              "answer": "the worm spearing the bat which led to the bat wriggling toward the spider",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "spider",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the spider's involvement?",
              "answer": "the whale crawled toward the heron",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "spider",
              "is_middle_entity": true
            }
          ],
          "whale": [
            {
              "question": "What did the whale do?",
              "answer": "crawl toward the heron",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "whale",
              "is_middle_entity": false
            },
            {
              "question": "What echolocated the whale?",
              "answer": "the spider",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "whale",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "whale",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was echolocated do?",
              "answer": "crawled toward the heron",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "whale",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the whale's action?",
              "answer": "the worm spearing the bat which led to the bat wriggling toward the spider which led to the spider echolocating the whale",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "whale",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the whale's involvement?",
              "answer": "the heron sang",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "whale",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 30
      },
      {
        "id": "complexity_4_sentence_15",
        "sentence": "The airplane that the spaceship that the boat that the truck that the bicycle strafed cycled around jackknifed into anchored near orbited.",
        "structure": [
          {
            "subject": "airplane",
            "action": "orbited",
            "object": null
          },
          {
            "subject": "spaceship",
            "action": "anchored near",
            "object": "airplane"
          },
          {
            "subject": "boat",
            "action": "jackknifed into",
            "object": "spaceship"
          },
          {
            "subject": "truck",
            "action": "cycled around",
            "object": "boat"
          },
          {
            "subject": "bicycle",
            "action": "strafed",
            "object": "truck"
          }
        ],
        "middle_entity": "boat",
        "all_entities": [
          "airplane",
          "boat",
          "bicycle",
          "spaceship",
          "truck"
        ],
        "questions_by_entity": {
          "airplane": [
            {
              "question": "What did the airplane do?",
              "answer": "orbit",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What anchored near the airplane?",
              "answer": "the spaceship",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was anchored near do?",
              "answer": "orbited",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the airplane's action?",
              "answer": "the bicycle strafing the truck which led to the truck cycling around the boat which led to the boat jackknifing into the spaceship which led to the spaceship anchoring near the airplane",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the airplane's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            }
          ],
          "boat": [
            {
              "question": "What did the boat do?",
              "answer": "jackknife into the spaceship",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": true
            },
            {
              "question": "What cycled around the boat?",
              "answer": "the truck",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was cycled around do?",
              "answer": "jackknifed into the spaceship",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the boat's action?",
              "answer": "the bicycle strafing the truck which led to the truck cycling around the boat",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the boat's involvement?",
              "answer": "the spaceship anchored near the airplane",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": true
            }
          ],
          "bicycle": [
            {
              "question": "What did the bicycle do?",
              "answer": "strafe the truck",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the bicycle?",
              "answer": "the truck",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the bicycle do?",
              "answer": "cycled around the boat",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the bicycle's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the bicycle's involvement?",
              "answer": "the truck cycled around the boat",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": false
            }
          ],
          "spaceship": [
            {
              "question": "What did the spaceship do?",
              "answer": "anchor near the airplane",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What jackknifed into the spaceship?",
              "answer": "the boat",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was jackknifed into do?",
              "answer": "anchored near the airplane",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the spaceship's action?",
              "answer": "the bicycle strafing the truck which led to the truck cycling around the boat which led to the boat jackknifing into the spaceship",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the spaceship's involvement?",
              "answer": "the airplane orbited",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            }
          ],
          "truck": [
            {
              "question": "What did the truck do?",
              "answer": "cycle around the boat",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What strafed the truck?",
              "answer": "the bicycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was strafed do?",
              "answer": "cycled around the boat",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the truck's action?",
              "answer": "the bicycle strafing the truck",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the truck's involvement?",
              "answer": "the boat jackknifed into the spaceship",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 30
      },
      {
        "id": "complexity_4_sentence_16",
        "sentence": "The spaceship that the motorcycle that the train that the boat that the bicycle orbited pedaled past sailed past whistled at wheelied.",
        "structure": [
          {
            "subject": "spaceship",
            "action": "wheelied",
            "object": null
          },
          {
            "subject": "motorcycle",
            "action": "whistled at",
            "object": "spaceship"
          },
          {
            "subject": "train",
            "action": "sailed past",
            "object": "motorcycle"
          },
          {
            "subject": "boat",
            "action": "pedaled past",
            "object": "train"
          },
          {
            "subject": "bicycle",
            "action": "orbited",
            "object": "boat"
          }
        ],
        "middle_entity": "train",
        "all_entities": [
          "train",
          "boat",
          "bicycle",
          "motorcycle",
          "spaceship"
        ],
        "questions_by_entity": {
          "train": [
            {
              "question": "What did the train do?",
              "answer": "sail past the motorcycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": true
            },
            {
              "question": "What pedaled past the train?",
              "answer": "the boat",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was pedaled past do?",
              "answer": "sailed past the motorcycle",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the train's action?",
              "answer": "the bicycle orbiting the boat which led to the boat pedaling past the train",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the train's involvement?",
              "answer": "the motorcycle whistled at the spaceship",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": true
            }
          ],
          "boat": [
            {
              "question": "What did the boat do?",
              "answer": "pedal past the train",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What orbited the boat?",
              "answer": "the bicycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was orbited do?",
              "answer": "pedaled past the train",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the boat's action?",
              "answer": "the bicycle orbiting the boat",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the boat's involvement?",
              "answer": "the train sailed past the motorcycle",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            }
          ],
          "bicycle": [
            {
              "question": "What did the bicycle do?",
              "answer": "orbit the boat",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the bicycle?",
              "answer": "the boat",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the bicycle do?",
              "answer": "pedaled past the train",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the bicycle's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the bicycle's involvement?",
              "answer": "the boat pedaled past the train",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": false
            }
          ],
          "motorcycle": [
            {
              "question": "What did the motorcycle do?",
              "answer": "whistle at the spaceship",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What sailed past the motorcycle?",
              "answer": "the train",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was sailed past do?",
              "answer": "whistled at the spaceship",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the motorcycle's action?",
              "answer": "the bicycle orbiting the boat which led to the boat pedaling past the train which led to the train sailing past the motorcycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the motorcycle's involvement?",
              "answer": "the spaceship wheelied",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": false
            }
          ],
          "spaceship": [
            {
              "question": "What did the spaceship do?",
              "answer": "wheelie",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What whistled at the spaceship?",
              "answer": "the motorcycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was whistled at do?",
              "answer": "wheelied",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the spaceship's action?",
              "answer": "the bicycle orbiting the boat which led to the boat pedaling past the train which led to the train sailing past the motorcycle which led to the motorcycle whistling at the spaceship",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the spaceship's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 30
      },
      {
        "id": "complexity_4_sentence_17",
        "sentence": "The ambulance that the truck that the bicycle that the spaceship that the train blared the siren at whistled at orbited cycled around jackknifed.",
        "structure": [
          {
            "subject": "ambulance",
            "action": "jackknifed",
            "object": null
          },
          {
            "subject": "truck",
            "action": "cycled around",
            "object": "ambulance"
          },
          {
            "subject": "bicycle",
            "action": "orbited",
            "object": "truck"
          },
          {
            "subject": "spaceship",
            "action": "whistled at",
            "object": "bicycle"
          },
          {
            "subject": "train",
            "action": "blared the siren at",
            "object": "spaceship"
          }
        ],
        "middle_entity": "bicycle",
        "all_entities": [
          "ambulance",
          "train",
          "bicycle",
          "spaceship",
          "truck"
        ],
        "questions_by_entity": {
          "ambulance": [
            {
              "question": "What did the ambulance do?",
              "answer": "jackknife",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What cycled around the ambulance?",
              "answer": "the truck",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was cycled around do?",
              "answer": "jackknifed",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the ambulance's action?",
              "answer": "the train blaring the siren at the spaceship which led to the spaceship whistling at the bicycle which led to the bicycle orbiting the truck which led to the truck cycling around the ambulance",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the ambulance's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": false
            }
          ],
          "train": [
            {
              "question": "What did the train do?",
              "answer": "siren at the spaceship",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the train?",
              "answer": "the spaceship",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the train do?",
              "answer": "whistled at the bicycle",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the train's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the train's involvement?",
              "answer": "the spaceship whistled at the bicycle",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            }
          ],
          "bicycle": [
            {
              "question": "What did the bicycle do?",
              "answer": "orbit the truck",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": true
            },
            {
              "question": "What whistled at the bicycle?",
              "answer": "the spaceship",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was whistled at do?",
              "answer": "orbited the truck",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the bicycle's action?",
              "answer": "the train blaring the siren at the spaceship which led to the spaceship whistling at the bicycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the bicycle's involvement?",
              "answer": "the truck cycled around the ambulance",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": true
            }
          ],
          "spaceship": [
            {
              "question": "What did the spaceship do?",
              "answer": "whistle at the bicycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What blared the siren at the spaceship?",
              "answer": "the train",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was blared the siren at do?",
              "answer": "whistled at the bicycle",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the spaceship's action?",
              "answer": "the train blaring the siren at the spaceship",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the spaceship's involvement?",
              "answer": "the bicycle orbited the truck",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            }
          ],
          "truck": [
            {
              "question": "What did the truck do?",
              "answer": "cycle around the ambulance",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What orbited the truck?",
              "answer": "the bicycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was orbited do?",
              "answer": "cycled around the ambulance",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the truck's action?",
              "answer": "the train blaring the siren at the spaceship which led to the spaceship whistling at the bicycle which led to the bicycle orbiting the truck",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the truck's involvement?",
              "answer": "the ambulance jackknifed",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 30
      },
      {
        "id": "complexity_4_sentence_18",
        "sentence": "The principal that the judge that the waiter that the doctor that the surgeon expelled sutured prescribed medicine to served presided.",
        "structure": [
          {
            "subject": "principal",
            "action": "presided",
            "object": null
          },
          {
            "subject": "judge",
            "action": "served",
            "object": "principal"
          },
          {
            "subject": "waiter",
            "action": "prescribed medicine to",
            "object": "judge"
          },
          {
            "subject": "doctor",
            "action": "sutured",
            "object": "waiter"
          },
          {
            "subject": "surgeon",
            "action": "expelled",
            "object": "doctor"
          }
        ],
        "middle_entity": "waiter",
        "all_entities": [
          "principal",
          "doctor",
          "waiter",
          "judge",
          "surgeon"
        ],
        "questions_by_entity": {
          "principal": [
            {
              "question": "What did the principal do?",
              "answer": "preside",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "Who served the principal?",
              "answer": "the judge",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was served do?",
              "answer": "presided",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the principal's action?",
              "answer": "the surgeon expelling the doctor which led to the doctor suturing the waiter which led to the waiter prescribing medicine to the judge which led to the judge serving the principal",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the principal's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "principal",
              "is_middle_entity": false
            }
          ],
          "doctor": [
            {
              "question": "What did the doctor do?",
              "answer": "suture the waiter",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "doctor",
              "is_middle_entity": false
            },
            {
              "question": "Who expelled the doctor?",
              "answer": "the surgeon",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "doctor",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "doctor",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was expelled do?",
              "answer": "sutured the waiter",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "doctor",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the doctor's action?",
              "answer": "the surgeon expelling the doctor",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "doctor",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the doctor's involvement?",
              "answer": "the waiter prescribed medicine to the judge",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "doctor",
              "is_middle_entity": false
            }
          ],
          "waiter": [
            {
              "question": "What did the waiter do?",
              "answer": "prescribe medicine to the judge",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "waiter",
              "is_middle_entity": true
            },
            {
              "question": "Who sutured the waiter?",
              "answer": "the doctor",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "waiter",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "waiter",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was sutured do?",
              "answer": "prescribed medicine to the judge",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "waiter",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the waiter's action?",
              "answer": "the surgeon expelling the doctor which led to the doctor suturing the waiter",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "waiter",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the waiter's involvement?",
              "answer": "the judge served the principal",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "waiter",
              "is_middle_entity": true
            }
          ],
          "judge": [
            {
              "question": "What did the judge do?",
              "answer": "serve the principal",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "Who prescribed medicine to the judge?",
              "answer": "the waiter",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was prescribed medicine  do?",
              "answer": "served the principal",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the judge's action?",
              "answer": "the surgeon expelling the doctor which led to the doctor suturing the waiter which led to the waiter prescribing medicine to the judge",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the judge's involvement?",
              "answer": "the principal presided",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "judge",
              "is_middle_entity": false
            }
          ],
          "surgeon": [
            {
              "question": "What did the surgeon do?",
              "answer": "expel the doctor",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "Who was affected by the surgeon?",
              "answer": "the doctor",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the surgeon do?",
              "answer": "sutured the waiter",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the surgeon's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the surgeon's involvement?",
              "answer": "the doctor sutured the waiter",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "surgeon",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 30
      },
      {
        "id": "complexity_4_sentence_19",
        "sentence": "The nurse that the lawyer that the judge that the waiter that the photographer bandaged shot seated ruled against objected to the statement.",
        "structure": [
          {
            "subject": "nurse",
            "action": "objected to the statement",
            "object": null
          },
          {
            "subject": "lawyer",
            "action": "ruled against",
            "object": "nurse"
          },
          {
            "subject": "judge",
            "action": "seated",
            "object": "lawyer"
          },
          {
            "subject": "waiter",
            "action": "shot",
            "object": "judge"
          },
          {
            "subject": "photographer",
            "action": "bandaged",
            "object": "waiter"
          }
        ],
        "middle_entity": "judge",
        "all_entities": [
          "lawyer",
          "waiter",
          "judge",
          "photographer",
          "nurse"
        ],
        "questions_by_entity": {
          "lawyer": [
            {
              "question": "What did the lawyer do?",
              "answer": "rule against the nurse",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "Who seated the lawyer?",
              "answer": "the judge",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was seated do?",
              "answer": "ruled against the nurse",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the lawyer's action?",
              "answer": "the photographer bandaging the waiter which led to the waiter shooting the judge which led to the judge seating the lawyer",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the lawyer's involvement?",
              "answer": "the nurse objected to the statement",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "lawyer",
              "is_middle_entity": false
            }
          ],
          "waiter": [
            {
              "question": "What did the waiter do?",
              "answer": "shoot the judge",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "Who bandaged the waiter?",
              "answer": "the photographer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was bandaged do?",
              "answer": "shot the judge",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the waiter's action?",
              "answer": "the photographer bandaging the waiter",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the waiter's involvement?",
              "answer": "the judge seated the lawyer",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "waiter",
              "is_middle_entity": false
            }
          ],
          "judge": [
            {
              "question": "What did the judge do?",
              "answer": "seat the lawyer",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "judge",
              "is_middle_entity": true
            },
            {
              "question": "Who shot the judge?",
              "answer": "the waiter",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "judge",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "judge",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was shot do?",
              "answer": "seated the lawyer",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "judge",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the judge's action?",
              "answer": "the photographer bandaging the waiter which led to the waiter shooting the judge",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "judge",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the judge's involvement?",
              "answer": "the lawyer ruled against the nurse",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "judge",
              "is_middle_entity": true
            }
          ],
          "photographer": [
            {
              "question": "What did the photographer do?",
              "answer": "bandage the waiter",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "Who was affected by the photographer?",
              "answer": "the waiter",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the photographer do?",
              "answer": "shot the judge",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the photographer's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the photographer's involvement?",
              "answer": "the waiter shot the judge",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "photographer",
              "is_middle_entity": false
            }
          ],
          "nurse": [
            {
              "question": "What did the nurse do?",
              "answer": "object to the statement",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "Who ruled against the nurse?",
              "answer": "the lawyer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was ruled against do?",
              "answer": "objected to the statement",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the nurse's action?",
              "answer": "the photographer bandaging the waiter which led to the waiter shooting the judge which led to the judge seating the lawyer which led to the lawyer ruling against the nurse",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the nurse's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "nurse",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 30
      },
      {
        "id": "complexity_4_sentence_20",
        "sentence": "The train that the truck that the boat that the bicycle that the ambulance whistled at blared the siren at rang the bell at sailed past jackknifed.",
        "structure": [
          {
            "subject": "train",
            "action": "jackknifed",
            "object": null
          },
          {
            "subject": "truck",
            "action": "sailed past",
            "object": "train"
          },
          {
            "subject": "boat",
            "action": "rang the bell at",
            "object": "truck"
          },
          {
            "subject": "bicycle",
            "action": "blared the siren at",
            "object": "boat"
          },
          {
            "subject": "ambulance",
            "action": "whistled at",
            "object": "bicycle"
          }
        ],
        "middle_entity": "boat",
        "all_entities": [
          "ambulance",
          "train",
          "boat",
          "bicycle",
          "truck"
        ],
        "questions_by_entity": {
          "ambulance": [
            {
              "question": "What did the ambulance do?",
              "answer": "whistle at the bicycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the ambulance?",
              "answer": "the bicycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the ambulance do?",
              "answer": "blared the siren at the boat",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the ambulance's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the ambulance's involvement?",
              "answer": "the bicycle blared the siren at the boat",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": false
            }
          ],
          "train": [
            {
              "question": "What did the train do?",
              "answer": "jackknife",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What sailed past the train?",
              "answer": "the truck",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was sailed past do?",
              "answer": "jackknifed",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the train's action?",
              "answer": "the ambulance whistling at the bicycle which led to the bicycle blaring the siren at the boat which led to the boat ringing the bell at the truck which led to the truck sailing past the train",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the train's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            }
          ],
          "boat": [
            {
              "question": "What did the boat do?",
              "answer": "ring the bell at the truck",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": true
            },
            {
              "question": "What blared the siren at the boat?",
              "answer": "the bicycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was blared the siren at do?",
              "answer": "rang the bell at the truck",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the boat's action?",
              "answer": "the ambulance whistling at the bicycle which led to the bicycle blaring the siren at the boat",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the boat's involvement?",
              "answer": "the truck sailed past the train",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": true
            }
          ],
          "bicycle": [
            {
              "question": "What did the bicycle do?",
              "answer": "siren at the boat",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What whistled at the bicycle?",
              "answer": "the ambulance",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was whistled at do?",
              "answer": "blared the siren at the boat",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the bicycle's action?",
              "answer": "the ambulance whistling at the bicycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the bicycle's involvement?",
              "answer": "the boat rang the bell at the truck",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": false
            }
          ],
          "truck": [
            {
              "question": "What did the truck do?",
              "answer": "sail past the train",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What rang the bell at the truck?",
              "answer": "the boat",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was ringed do?",
              "answer": "sailed past the train",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the truck's action?",
              "answer": "the ambulance whistling at the bicycle which led to the bicycle blaring the siren at the boat which led to the boat ringing the bell at the truck",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the truck's involvement?",
              "answer": "the train jackknifed",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 30
      },
      {
        "id": "complexity_4_sentence_21",
        "sentence": "The lizard that the grasshopper that the lion that the seagull that the vulture basked toward scavenged from dive-bombed roared at chirped.",
        "structure": [
          {
            "subject": "lizard",
            "action": "chirped",
            "object": null
          },
          {
            "subject": "grasshopper",
            "action": "roared at",
            "object": "lizard"
          },
          {
            "subject": "lion",
            "action": "dive-bombed",
            "object": "grasshopper"
          },
          {
            "subject": "seagull",
            "action": "scavenged from",
            "object": "lion"
          },
          {
            "subject": "vulture",
            "action": "basked toward",
            "object": "seagull"
          }
        ],
        "middle_entity": "lion",
        "all_entities": [
          "lizard",
          "seagull",
          "vulture",
          "grasshopper",
          "lion"
        ],
        "questions_by_entity": {
          "lizard": [
            {
              "question": "What did the lizard do?",
              "answer": "chirp",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "lizard",
              "is_middle_entity": false
            },
            {
              "question": "What roared at the lizard?",
              "answer": "the grasshopper",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "lizard",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "lizard",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was roared at do?",
              "answer": "chirped",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "lizard",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the lizard's action?",
              "answer": "the vulture basking toward the seagull which led to the seagull scavenging from the lion which led to the lion dive-bombing the grasshopper which led to the grasshopper roaring at the lizard",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "lizard",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the lizard's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "lizard",
              "is_middle_entity": false
            }
          ],
          "seagull": [
            {
              "question": "What did the seagull do?",
              "answer": "scavenge from the lion",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "seagull",
              "is_middle_entity": false
            },
            {
              "question": "What basked toward the seagull?",
              "answer": "the vulture",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "seagull",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "seagull",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was basked toward do?",
              "answer": "scavenged from the lion",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "seagull",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the seagull's action?",
              "answer": "the vulture basking toward the seagull",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "seagull",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the seagull's involvement?",
              "answer": "the lion dive-bombed the grasshopper",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "seagull",
              "is_middle_entity": false
            }
          ],
          "vulture": [
            {
              "question": "What did the vulture do?",
              "answer": "bask toward the seagull",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "vulture",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the vulture?",
              "answer": "the seagull",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "vulture",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "vulture",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the vulture do?",
              "answer": "scavenged from the lion",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "vulture",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the vulture's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "vulture",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the vulture's involvement?",
              "answer": "the seagull scavenged from the lion",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "vulture",
              "is_middle_entity": false
            }
          ],
          "grasshopper": [
            {
              "question": "What did the grasshopper do?",
              "answer": "roar at the lizard",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "grasshopper",
              "is_middle_entity": false
            },
            {
              "question": "What dive-bombed the grasshopper?",
              "answer": "the lion",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "grasshopper",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "grasshopper",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was dive-bombed do?",
              "answer": "roared at the lizard",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "grasshopper",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the grasshopper's action?",
              "answer": "the vulture basking toward the seagull which led to the seagull scavenging from the lion which led to the lion dive-bombing the grasshopper",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "grasshopper",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the grasshopper's involvement?",
              "answer": "the lizard chirped",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "grasshopper",
              "is_middle_entity": false
            }
          ],
          "lion": [
            {
              "question": "What did the lion do?",
              "answer": "dive-bomb the grasshopper",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "lion",
              "is_middle_entity": true
            },
            {
              "question": "What scavenged from the lion?",
              "answer": "the seagull",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "lion",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "lion",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was scavenged from do?",
              "answer": "dive-bombed the grasshopper",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "lion",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the lion's action?",
              "answer": "the vulture basking toward the seagull which led to the seagull scavenging from the lion",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "lion",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the lion's involvement?",
              "answer": "the grasshopper roared at the lizard",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "lion",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 30
      },
      {
        "id": "complexity_4_sentence_22",
        "sentence": "The principal that the lawyer that the firefighter that the judge that the doctor disciplined examined with a stethoscope sentenced rescued argued.",
        "structure": [
          {
            "subject": "principal",
            "action": "argued",
            "object": null
          },
          {
            "subject": "lawyer",
            "action": "rescued",
            "object": "principal"
          },
          {
            "subject": "firefighter",
            "action": "sentenced",
            "object": "lawyer"
          },
          {
            "subject": "judge",
            "action": "examined with a stethoscope",
            "object": "firefighter"
          },
          {
            "subject": "doctor",
            "action": "disciplined",
            "object": "judge"
          }
        ],
        "middle_entity": "firefighter",
        "all_entities": [
          "principal",
          "doctor",
          "lawyer",
          "judge",
          "firefighter"
        ],
        "questions_by_entity": {
          "principal": [
            {
              "question": "What did the principal do?",
              "answer": "argue",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "Who rescued the principal?",
              "answer": "the lawyer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was rescued do?",
              "answer": "argued",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the principal's action?",
              "answer": "the doctor disciplining the judge which led to the judge examining  the firefighter with a stethoscope which led to the firefighter sentencing the lawyer which led to the lawyer rescuing the principal",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the principal's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "principal",
              "is_middle_entity": false
            }
          ],
          "doctor": [
            {
              "question": "What did the doctor do?",
              "answer": "discipline the judge",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "doctor",
              "is_middle_entity": false
            },
            {
              "question": "Who was affected by the doctor?",
              "answer": "the judge",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "doctor",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "doctor",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the doctor do?",
              "answer": "examined  the firefighter with a stethoscope",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "doctor",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the doctor's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "doctor",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the doctor's involvement?",
              "answer": "the judge examined  the firefighter with a stethoscope",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "doctor",
              "is_middle_entity": false
            }
          ],
          "lawyer": [
            {
              "question": "What did the lawyer do?",
              "answer": "rescue the principal",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "Who sentenced the lawyer?",
              "answer": "the firefighter",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was sentenced do?",
              "answer": "rescued the principal",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the lawyer's action?",
              "answer": "the doctor disciplining the judge which led to the judge examining the firefighter with a stethoscope which led to the firefighter sentencing the lawyer",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the lawyer's involvement?",
              "answer": "the principal argued",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "lawyer",
              "is_middle_entity": false
            }
          ],
          "judge": [
            {
              "question": "What did the judge do?",
              "answer": "examine the firefighter  with a stethoscope",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "Who disciplined the judge?",
              "answer": "the doctor",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was disciplined do?",
              "answer": "examined  the firefighter with a stethoscope",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the judge's action?",
              "answer": "the doctor disciplining the judge",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the judge's involvement?",
              "answer": "the firefighter sentenced the lawyer",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "judge",
              "is_middle_entity": false
            }
          ],
          "firefighter": [
            {
              "question": "What did the firefighter do?",
              "answer": "sentence the lawyer",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "firefighter",
              "is_middle_entity": true
            },
            {
              "question": "Who examined  the firefighter with a stethoscope?",
              "answer": "the judge",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "firefighter",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "firefighter",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was examined with a stethoscope do?",
              "answer": "sentenced the lawyer",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "firefighter",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the firefighter's action?",
              "answer": "the doctor disciplining the judge which led to the judge examining the firefighter with a stethoscope",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "firefighter",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the firefighter's involvement?",
              "answer": "the lawyer rescued the principal",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "firefighter",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 30
      },
      {
        "id": "complexity_4_sentence_23",
        "sentence": "The spaceship that the bicycle that the train that the ambulance that the motorcycle orbited lane-split past blared the siren at whistled at pedaled.",
        "structure": [
          {
            "subject": "spaceship",
            "action": "pedaled",
            "object": null
          },
          {
            "subject": "bicycle",
            "action": "whistled at",
            "object": "spaceship"
          },
          {
            "subject": "train",
            "action": "blared the siren at",
            "object": "bicycle"
          },
          {
            "subject": "ambulance",
            "action": "lane-split past",
            "object": "train"
          },
          {
            "subject": "motorcycle",
            "action": "orbited",
            "object": "ambulance"
          }
        ],
        "middle_entity": "train",
        "all_entities": [
          "ambulance",
          "train",
          "bicycle",
          "motorcycle",
          "spaceship"
        ],
        "questions_by_entity": {
          "ambulance": [
            {
              "question": "What did the ambulance do?",
              "answer": "lane-split past the train",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What orbited the ambulance?",
              "answer": "the motorcycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was orbited do?",
              "answer": "lane-split past the train",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the ambulance's action?",
              "answer": "the motorcycle orbiting the ambulance",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the ambulance's involvement?",
              "answer": "the train blared the siren at the bicycle",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": false
            }
          ],
          "train": [
            {
              "question": "What did the train do?",
              "answer": "siren at the bicycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": true
            },
            {
              "question": "What lane-split past the train?",
              "answer": "the ambulance",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was lane-split past do?",
              "answer": "blared the siren at the bicycle",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the train's action?",
              "answer": "the motorcycle orbiting the ambulance which led to the ambulance lane-splitting past the train",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the train's involvement?",
              "answer": "the bicycle whistled at the spaceship",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": true
            }
          ],
          "bicycle": [
            {
              "question": "What did the bicycle do?",
              "answer": "whistle at the spaceship",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What blared the siren at the bicycle?",
              "answer": "the train",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was blared the siren at do?",
              "answer": "whistled at the spaceship",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the bicycle's action?",
              "answer": "the motorcycle orbiting the ambulance which led to the ambulance lane-splitting past the train which led to the train blaring the siren at the bicycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the bicycle's involvement?",
              "answer": "the spaceship pedaled",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": false
            }
          ],
          "motorcycle": [
            {
              "question": "What did the motorcycle do?",
              "answer": "orbit the ambulance",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the motorcycle?",
              "answer": "the ambulance",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the motorcycle do?",
              "answer": "lane-split past the train",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the motorcycle's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the motorcycle's involvement?",
              "answer": "the ambulance lane-split past the train",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": false
            }
          ],
          "spaceship": [
            {
              "question": "What did the spaceship do?",
              "answer": "pedal",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What whistled at the spaceship?",
              "answer": "the bicycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was whistled at do?",
              "answer": "pedaled",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the spaceship's action?",
              "answer": "the motorcycle orbiting the ambulance which led to the ambulance lane-splitting past the train which led to the train blaring the siren at the bicycle which led to the bicycle whistling at the spaceship",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the spaceship's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 30
      },
      {
        "id": "complexity_4_sentence_24",
        "sentence": "The pig that the cockroach that the rabbit that the coyote that the pelican rooted at scooped at yipped at hopped toward crawled.",
        "structure": [
          {
            "subject": "pig",
            "action": "crawled",
            "object": null
          },
          {
            "subject": "cockroach",
            "action": "hopped toward",
            "object": "pig"
          },
          {
            "subject": "rabbit",
            "action": "yipped at",
            "object": "cockroach"
          },
          {
            "subject": "coyote",
            "action": "scooped at",
            "object": "rabbit"
          },
          {
            "subject": "pelican",
            "action": "rooted at",
            "object": "coyote"
          }
        ],
        "middle_entity": "rabbit",
        "all_entities": [
          "pig",
          "cockroach",
          "pelican",
          "coyote",
          "rabbit"
        ],
        "questions_by_entity": {
          "pig": [
            {
              "question": "What did the pig do?",
              "answer": "crawl",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "pig",
              "is_middle_entity": false
            },
            {
              "question": "What hopped toward the pig?",
              "answer": "the cockroach",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "pig",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "pig",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was hopped toward do?",
              "answer": "crawled",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "pig",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the pig's action?",
              "answer": "the pelican rooting at the coyote which led to the coyote scooping at the rabbit which led to the rabbit yipping at the cockroach which led to the cockroach hopping toward the pig",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "pig",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the pig's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "pig",
              "is_middle_entity": false
            }
          ],
          "cockroach": [
            {
              "question": "What did the cockroach do?",
              "answer": "hop toward the pig",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "cockroach",
              "is_middle_entity": false
            },
            {
              "question": "What yipped at the cockroach?",
              "answer": "the rabbit",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "cockroach",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "cockroach",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was yipped at do?",
              "answer": "hopped toward the pig",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "cockroach",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the cockroach's action?",
              "answer": "the pelican rooting at the coyote which led to the coyote scooping at the rabbit which led to the rabbit yipping at the cockroach",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "cockroach",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the cockroach's involvement?",
              "answer": "the pig crawled",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "cockroach",
              "is_middle_entity": false
            }
          ],
          "pelican": [
            {
              "question": "What did the pelican do?",
              "answer": "root at the coyote",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "pelican",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the pelican?",
              "answer": "the coyote",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "pelican",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "pelican",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the pelican do?",
              "answer": "scooped at the rabbit",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "pelican",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the pelican's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "pelican",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the pelican's involvement?",
              "answer": "the coyote scooped at the rabbit",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "pelican",
              "is_middle_entity": false
            }
          ],
          "coyote": [
            {
              "question": "What did the coyote do?",
              "answer": "scoop at the rabbit",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "coyote",
              "is_middle_entity": false
            },
            {
              "question": "What rooted at the coyote?",
              "answer": "the pelican",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "coyote",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "coyote",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was rooted at do?",
              "answer": "scooped at the rabbit",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "coyote",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the coyote's action?",
              "answer": "the pelican rooting at the coyote",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "coyote",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the coyote's involvement?",
              "answer": "the rabbit yipped at the cockroach",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "coyote",
              "is_middle_entity": false
            }
          ],
          "rabbit": [
            {
              "question": "What did the rabbit do?",
              "answer": "yip at the cockroach",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "rabbit",
              "is_middle_entity": true
            },
            {
              "question": "What scooped at the rabbit?",
              "answer": "the coyote",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "rabbit",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "rabbit",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was scooped at do?",
              "answer": "yipped at the cockroach",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "rabbit",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the rabbit's action?",
              "answer": "the pelican rooting at the coyote which led to the coyote scooping at the rabbit",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "rabbit",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the rabbit's involvement?",
              "answer": "the cockroach hopped toward the pig",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "rabbit",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 30
      },
      {
        "id": "complexity_4_sentence_25",
        "sentence": "The cat that the tuna that the cow that the bee that the octopus purred at inked at stung mooed at swam.",
        "structure": [
          {
            "subject": "cat",
            "action": "swam",
            "object": null
          },
          {
            "subject": "tuna",
            "action": "mooed at",
            "object": "cat"
          },
          {
            "subject": "cow",
            "action": "stung",
            "object": "tuna"
          },
          {
            "subject": "bee",
            "action": "oinked at",
            "object": "cow"
          },
          {
            "subject": "octopus",
            "action": "purred at",
            "object": "bee"
          }
        ],
        "middle_entity": "cow",
        "all_entities": [
          "bee",
          "cat",
          "octopus",
          "tuna",
          "cow"
        ],
        "questions_by_entity": {
          "bee": [
            {
              "question": "What did the bee do?",
              "answer": "oink at the cow",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "bee",
              "is_middle_entity": false
            },
            {
              "question": "What purred at the bee?",
              "answer": "the octopus",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "bee",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "bee",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was purred at do?",
              "answer": "oinked at the cow",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "bee",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the bee's action?",
              "answer": "the octopus purring at the bee",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "bee",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the bee's involvement?",
              "answer": "the cow stung the tuna",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "bee",
              "is_middle_entity": false
            }
          ],
          "cat": [
            {
              "question": "What did the cat do?",
              "answer": "swim",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "cat",
              "is_middle_entity": false
            },
            {
              "question": "What mooed at the cat?",
              "answer": "the tuna",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "cat",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "cat",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was mooed at do?",
              "answer": "swam",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "cat",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the cat's action?",
              "answer": "the octopus purring at the bee which led to the bee inking at the cow which led to the cow stinging the tuna which led to the tuna mooing at the cat",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "cat",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the cat's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "cat",
              "is_middle_entity": false
            }
          ],
          "octopus": [
            {
              "question": "What did the octopus do?",
              "answer": "purr at the bee",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "octopus",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the octopus?",
              "answer": "the bee",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "octopus",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "octopus",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the octopus do?",
              "answer": "oinked at the cow",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "octopus",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the octopus's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "octopus",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the octopus's involvement?",
              "answer": "the bee inked at the cow",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "octopus",
              "is_middle_entity": false
            }
          ],
          "tuna": [
            {
              "question": "What did the tuna do?",
              "answer": "moo at the cat",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "tuna",
              "is_middle_entity": false
            },
            {
              "question": "What stung the tuna?",
              "answer": "the cow",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "tuna",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "tuna",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was stung do?",
              "answer": "mooed at the cat",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "tuna",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the tuna's action?",
              "answer": "the octopus purring at the bee which led to the bee inking at the cow which led to the cow stinging the tuna",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "tuna",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the tuna's involvement?",
              "answer": "the cat swam",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "tuna",
              "is_middle_entity": false
            }
          ],
          "cow": [
            {
              "question": "What did the cow do?",
              "answer": "sting the tuna",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "cow",
              "is_middle_entity": true
            },
            {
              "question": "What inked at the cow?",
              "answer": "the bee",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "cow",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "cow",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was inked at do?",
              "answer": "stung the tuna",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "cow",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the cow's action?",
              "answer": "the octopus purring at the bee which led to the bee inking at the cow",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "cow",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the cow's involvement?",
              "answer": "the tuna mooed at the cat",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "cow",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 30
      },
      {
        "id": "complexity_4_sentence_26",
        "sentence": "The nurse that the judge that the principal that the surgeon that the firefighter bandaged carried out operated on suspended gaveled.",
        "structure": [
          {
            "subject": "nurse",
            "action": "gaveled",
            "object": null
          },
          {
            "subject": "judge",
            "action": "suspended",
            "object": "nurse"
          },
          {
            "subject": "principal",
            "action": "operated on",
            "object": "judge"
          },
          {
            "subject": "surgeon",
            "action": "carried out",
            "object": "principal"
          },
          {
            "subject": "firefighter",
            "action": "bandaged",
            "object": "surgeon"
          }
        ],
        "middle_entity": "principal",
        "all_entities": [
          "principal",
          "judge",
          "surgeon",
          "nurse",
          "firefighter"
        ],
        "questions_by_entity": {
          "principal": [
            {
              "question": "What did the principal do?",
              "answer": "operate on the judge",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "principal",
              "is_middle_entity": true
            },
            {
              "question": "Who carried out the principal?",
              "answer": "the surgeon",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "principal",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "principal",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was carried out do?",
              "answer": "operated on the judge",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "principal",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the principal's action?",
              "answer": "the firefighter bandaging the surgeon which led to the surgeon carrying the principal out ",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "principal",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the principal's involvement?",
              "answer": "the judge suspended the nurse",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "principal",
              "is_middle_entity": true
            }
          ],
          "judge": [
            {
              "question": "What did the judge do?",
              "answer": "suspend the nurse",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "Who operated on the judge?",
              "answer": "the principal",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was operated on do?",
              "answer": "suspended the nurse",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the judge's action?",
              "answer": "the firefighter bandaging the surgeon which led to the surgeon carrying the principal out which led to the principal operating on the judge",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the judge's involvement?",
              "answer": "the nurse gaveled",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "judge",
              "is_middle_entity": false
            }
          ],
          "surgeon": [
            {
              "question": "What did the surgeon do?",
              "answer": "carry the principal out ",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "Who bandaged the surgeon?",
              "answer": "the firefighter",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was bandaged do?",
              "answer": "carried the principal out ",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the surgeon's action?",
              "answer": "the firefighter bandaging the surgeon",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the surgeon's involvement?",
              "answer": "the principal operated on the judge",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "surgeon",
              "is_middle_entity": false
            }
          ],
          "nurse": [
            {
              "question": "What did the nurse do?",
              "answer": "gavel",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "Who suspended the nurse?",
              "answer": "the judge",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was suspended do?",
              "answer": "gaveled",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the nurse's action?",
              "answer": "the firefighter bandaging the surgeon which led to the surgeon carrying  the principal out which led to the principal operating on the judge which led to the judge suspending the nurse",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the nurse's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "nurse",
              "is_middle_entity": false
            }
          ],
          "firefighter": [
            {
              "question": "What did the firefighter do?",
              "answer": "bandage the surgeon",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "Who was affected by the firefighter?",
              "answer": "the surgeon",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the firefighter do?",
              "answer": "carried the principal out ",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the firefighter's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the firefighter's involvement?",
              "answer": "the surgeon carried the principal out ",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "firefighter",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 30
      },
      {
        "id": "complexity_4_sentence_27",
        "sentence": "The bicycle that the motorcycle that the spaceship that the train that the truck pedaled past jackknifed into whistled at orbited wheelied.",
        "structure": [
          {
            "subject": "bicycle",
            "action": "wheelied",
            "object": null
          },
          {
            "subject": "motorcycle",
            "action": "orbited",
            "object": "bicycle"
          },
          {
            "subject": "spaceship",
            "action": "whistled at",
            "object": "motorcycle"
          },
          {
            "subject": "train",
            "action": "jackknifed into",
            "object": "spaceship"
          },
          {
            "subject": "truck",
            "action": "pedaled past",
            "object": "train"
          }
        ],
        "middle_entity": "spaceship",
        "all_entities": [
          "train",
          "bicycle",
          "truck",
          "spaceship",
          "motorcycle"
        ],
        "questions_by_entity": {
          "train": [
            {
              "question": "What did the train do?",
              "answer": "jackknife into the spaceship",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What pedaled past the train?",
              "answer": "the truck",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was pedaled past do?",
              "answer": "jackknifed into the spaceship",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the train's action?",
              "answer": "the truck pedaling past the train",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the train's involvement?",
              "answer": "the spaceship whistled at the motorcycle",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            }
          ],
          "bicycle": [
            {
              "question": "What did the bicycle do?",
              "answer": "wheelie",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What orbited the bicycle?",
              "answer": "the motorcycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was orbited do?",
              "answer": "wheelied",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the bicycle's action?",
              "answer": "the truck pedaling past the train which led to the train jackknifing into the spaceship which led to the spaceship whistling at the motorcycle which led to the motorcycle orbiting the bicycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the bicycle's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": false
            }
          ],
          "truck": [
            {
              "question": "What did the truck do?",
              "answer": "pedal past the train",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the truck?",
              "answer": "the train",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the truck do?",
              "answer": "jackknifed into the spaceship",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the truck's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the truck's involvement?",
              "answer": "the train jackknifed into the spaceship",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            }
          ],
          "spaceship": [
            {
              "question": "What did the spaceship do?",
              "answer": "whistle at the motorcycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": true
            },
            {
              "question": "What jackknifed into the spaceship?",
              "answer": "the train",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was jackknifed into do?",
              "answer": "whistled at the motorcycle",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the spaceship's action?",
              "answer": "the truck pedaling past the train which led to the train jackknifing into the spaceship",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the spaceship's involvement?",
              "answer": "the motorcycle orbited the bicycle",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": true
            }
          ],
          "motorcycle": [
            {
              "question": "What did the motorcycle do?",
              "answer": "orbit the bicycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What whistled at the motorcycle?",
              "answer": "the spaceship",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was whistled at do?",
              "answer": "orbited the bicycle",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the motorcycle's action?",
              "answer": "the truck pedaling past the train which led to the train jackknifing into the spaceship which led to the spaceship whistling at the motorcycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the motorcycle's involvement?",
              "answer": "the bicycle wheelied",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 30
      },
      {
        "id": "complexity_4_sentence_28",
        "sentence": "The vulture that the frog that the pelican that the lizard that the donkey scavenged from brayed at basked toward scooped at hopped.",
        "structure": [
          {
            "subject": "vulture",
            "action": "hopped",
            "object": null
          },
          {
            "subject": "frog",
            "action": "scooped at",
            "object": "vulture"
          },
          {
            "subject": "pelican",
            "action": "basked toward",
            "object": "frog"
          },
          {
            "subject": "lizard",
            "action": "brayed at",
            "object": "pelican"
          },
          {
            "subject": "donkey",
            "action": "scavenged from",
            "object": "lizard"
          }
        ],
        "middle_entity": "pelican",
        "all_entities": [
          "lizard",
          "pelican",
          "donkey",
          "vulture",
          "frog"
        ],
        "questions_by_entity": {
          "lizard": [
            {
              "question": "What did the lizard do?",
              "answer": "bray at the pelican",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "lizard",
              "is_middle_entity": false
            },
            {
              "question": "What scavenged from the lizard?",
              "answer": "the donkey",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "lizard",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "lizard",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was scavenged from do?",
              "answer": "brayed at the pelican",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "lizard",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the lizard's action?",
              "answer": "the donkey scavenging from the lizard",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "lizard",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the lizard's involvement?",
              "answer": "the pelican basked toward the frog",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "lizard",
              "is_middle_entity": false
            }
          ],
          "pelican": [
            {
              "question": "What did the pelican do?",
              "answer": "bask toward the frog",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "pelican",
              "is_middle_entity": true
            },
            {
              "question": "What brayed at the pelican?",
              "answer": "the lizard",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "pelican",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "pelican",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was brayed at do?",
              "answer": "basked toward the frog",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "pelican",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the pelican's action?",
              "answer": "the donkey scavenging from the lizard which led to the lizard braying at the pelican",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "pelican",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the pelican's involvement?",
              "answer": "the frog scooped at the vulture",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "pelican",
              "is_middle_entity": true
            }
          ],
          "donkey": [
            {
              "question": "What did the donkey do?",
              "answer": "scavenge from the lizard",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "donkey",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the donkey?",
              "answer": "the lizard",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "donkey",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "donkey",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the donkey do?",
              "answer": "brayed at the pelican",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "donkey",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the donkey's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "donkey",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the donkey's involvement?",
              "answer": "the lizard brayed at the pelican",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "donkey",
              "is_middle_entity": false
            }
          ],
          "vulture": [
            {
              "question": "What did the vulture do?",
              "answer": "hop",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "vulture",
              "is_middle_entity": false
            },
            {
              "question": "What scooped at the vulture?",
              "answer": "the frog",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "vulture",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "vulture",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was scooped at do?",
              "answer": "hopped",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "vulture",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the vulture's action?",
              "answer": "the donkey scavenging from the lizard which led to the lizard braying at the pelican which led to the pelican basking toward the frog which led to the frog scooping at the vulture",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "vulture",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the vulture's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "vulture",
              "is_middle_entity": false
            }
          ],
          "frog": [
            {
              "question": "What did the frog do?",
              "answer": "scoop at the vulture",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "frog",
              "is_middle_entity": false
            },
            {
              "question": "What basked toward the frog?",
              "answer": "the pelican",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "frog",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "frog",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was basked toward do?",
              "answer": "scooped at the vulture",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "frog",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the frog's action?",
              "answer": "the donkey scavenging from the lizard which led to the lizard braying at the pelican which led to the pelican basking toward the frog",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "frog",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the frog's involvement?",
              "answer": "the vulture hopped",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "frog",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 30
      },
      {
        "id": "complexity_4_sentence_29",
        "sentence": "The cat that the lizard that the bat that the giraffe that the elephant purred at charged at stretched toward echolocated darted.",
        "structure": [
          {
            "subject": "cat",
            "action": "darted",
            "object": null
          },
          {
            "subject": "lizard",
            "action": "echolocated",
            "object": "cat"
          },
          {
            "subject": "bat",
            "action": "stretched toward",
            "object": "lizard"
          },
          {
            "subject": "giraffe",
            "action": "charged at",
            "object": "bat"
          },
          {
            "subject": "elephant",
            "action": "purred at",
            "object": "giraffe"
          }
        ],
        "middle_entity": "bat",
        "all_entities": [
          "lizard",
          "bat",
          "cat",
          "elephant",
          "giraffe"
        ],
        "questions_by_entity": {
          "lizard": [
            {
              "question": "What did the lizard do?",
              "answer": "echolocate the cat",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "lizard",
              "is_middle_entity": false
            },
            {
              "question": "What stretched toward the lizard?",
              "answer": "the bat",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "lizard",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "lizard",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was stretched toward do?",
              "answer": "echolocated the cat",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "lizard",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the lizard's action?",
              "answer": "the elephant purring at the giraffe which led to the giraffe charging at the bat which led to the bat stretching toward the lizard",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "lizard",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the lizard's involvement?",
              "answer": "the cat darted",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "lizard",
              "is_middle_entity": false
            }
          ],
          "bat": [
            {
              "question": "What did the bat do?",
              "answer": "stretch toward the lizard",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "bat",
              "is_middle_entity": true
            },
            {
              "question": "What charged at the bat?",
              "answer": "the giraffe",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "bat",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "bat",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was charged at do?",
              "answer": "stretched toward the lizard",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "bat",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the bat's action?",
              "answer": "the elephant purring at the giraffe which led to the giraffe charging at the bat",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "bat",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the bat's involvement?",
              "answer": "the lizard echolocated the cat",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "bat",
              "is_middle_entity": true
            }
          ],
          "cat": [
            {
              "question": "What did the cat do?",
              "answer": "dart",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "cat",
              "is_middle_entity": false
            },
            {
              "question": "What echolocated the cat?",
              "answer": "the lizard",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "cat",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "cat",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was echolocated do?",
              "answer": "darted",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "cat",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the cat's action?",
              "answer": "the elephant purring at the giraffe which led to the giraffe charging at the bat which led to the bat stretching toward the lizard which led to the lizard echolocating the cat",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "cat",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the cat's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "cat",
              "is_middle_entity": false
            }
          ],
          "elephant": [
            {
              "question": "What did the elephant do?",
              "answer": "purr at the giraffe",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "elephant",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the elephant?",
              "answer": "the giraffe",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "elephant",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "elephant",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the elephant do?",
              "answer": "charged at the bat",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "elephant",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the elephant's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "elephant",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the elephant's involvement?",
              "answer": "the giraffe charged at the bat",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "elephant",
              "is_middle_entity": false
            }
          ],
          "giraffe": [
            {
              "question": "What did the giraffe do?",
              "answer": "charge at the bat",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "giraffe",
              "is_middle_entity": false
            },
            {
              "question": "What purred at the giraffe?",
              "answer": "the elephant",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "giraffe",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "giraffe",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was purred at do?",
              "answer": "charged at the bat",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "giraffe",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the giraffe's action?",
              "answer": "the elephant purring at the giraffe",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "giraffe",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the giraffe's involvement?",
              "answer": "the bat stretched toward the lizard",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "giraffe",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 30
      },
      {
        "id": "complexity_4_sentence_30",
        "sentence": "The truck that the boat that the motorcycle that the airplane that the train jackknifed into whistled at strafed lane-split past sailed.",
        "structure": [
          {
            "subject": "truck",
            "action": "sailed",
            "object": null
          },
          {
            "subject": "boat",
            "action": "lane-split past",
            "object": "truck"
          },
          {
            "subject": "motorcycle",
            "action": "strafed",
            "object": "boat"
          },
          {
            "subject": "airplane",
            "action": "whistled at",
            "object": "motorcycle"
          },
          {
            "subject": "train",
            "action": "jackknifed into",
            "object": "airplane"
          }
        ],
        "middle_entity": "motorcycle",
        "all_entities": [
          "airplane",
          "train",
          "boat",
          "motorcycle",
          "truck"
        ],
        "questions_by_entity": {
          "airplane": [
            {
              "question": "What did the airplane do?",
              "answer": "whistle at the motorcycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What jackknifed into the airplane?",
              "answer": "the train",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was jackknifed into do?",
              "answer": "whistled at the motorcycle",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the airplane's action?",
              "answer": "the train jackknifing into the airplane",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the airplane's involvement?",
              "answer": "the motorcycle strafed the boat",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            }
          ],
          "train": [
            {
              "question": "What did the train do?",
              "answer": "jackknife into the airplane",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the train?",
              "answer": "the airplane",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the train do?",
              "answer": "whistled at the motorcycle",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the train's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the train's involvement?",
              "answer": "the airplane whistled at the motorcycle",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            }
          ],
          "boat": [
            {
              "question": "What did the boat do?",
              "answer": "lane-split past the truck",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What strafed the boat?",
              "answer": "the motorcycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was strafed do?",
              "answer": "lane-split past the truck",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the boat's action?",
              "answer": "the train jackknifing into the airplane which led to the airplane whistling at the motorcycle which led to the motorcycle strafing the boat",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the boat's involvement?",
              "answer": "the truck sailed",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            }
          ],
          "motorcycle": [
            {
              "question": "What did the motorcycle do?",
              "answer": "strafe the boat",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "What whistled at the motorcycle?",
              "answer": "the airplane",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was whistled at do?",
              "answer": "strafed the boat",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the motorcycle's action?",
              "answer": "the train jackknifing into the airplane which led to the airplane whistling at the motorcycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the motorcycle's involvement?",
              "answer": "the boat lane-split past the truck",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": true
            }
          ],
          "truck": [
            {
              "question": "What did the truck do?",
              "answer": "sail",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What lane-split past the truck?",
              "answer": "the boat",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "5",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was lane-split past do?",
              "answer": "sailed",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the truck's action?",
              "answer": "the train jackknifing into the airplane which led to the airplane whistling at the motorcycle which led to the motorcycle strafing the boat which led to the boat lane-splitting past the truck",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the truck's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 30
      }
    ],
    "total_questions": 900,
    "entities_processed": 150,
    "middle_entities_flagged": 30
  },
  "complexity_5": {
    "sentences": [
      {
        "id": "complexity_5_sentence_1",
        "sentence": "The mailman that the lawyer that the judge that the photographer that the teacher that the firefighter delivered mail to rescued graded photographed ruled against objected to the statement.",
        "structure": [
          {
            "subject": "mailman",
            "action": "objected to the statement",
            "object": null
          },
          {
            "subject": "lawyer",
            "action": "ruled against",
            "object": "mailman"
          },
          {
            "subject": "judge",
            "action": "photographed",
            "object": "lawyer"
          },
          {
            "subject": "photographer",
            "action": "graded",
            "object": "judge"
          },
          {
            "subject": "teacher",
            "action": "rescued",
            "object": "photographer"
          },
          {
            "subject": "firefighter",
            "action": "delivered mail to",
            "object": "teacher"
          }
        ],
        "middle_entity": "judge",
        "all_entities": [
          "mailman",
          "teacher",
          "lawyer",
          "judge",
          "photographer",
          "firefighter"
        ],
        "questions_by_entity": {
          "mailman": [
            {
              "question": "What did the mailman do?",
              "answer": "object to the statement",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "Who ruled against the mailman?",
              "answer": "the lawyer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was ruled against do?",
              "answer": "objected to the statement",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the mailman's action?",
              "answer": "the firefighter delivering mail to the teacher which led to the teacher rescuing the photographer which led to the photographer grading the judge which led to the judge photographing the lawyer which led to the lawyer ruling against the mailman",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the mailman's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "mailman",
              "is_middle_entity": false
            }
          ],
          "teacher": [
            {
              "question": "What did the teacher do?",
              "answer": "rescue the photographer",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "Who delivered mail to the teacher?",
              "answer": "the firefighter",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was delivered mail do?",
              "answer": "rescued the photographer",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the teacher's action?",
              "answer": "the firefighter delivering mail to the teacher",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the teacher's involvement?",
              "answer": "the photographer graded the judge",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "teacher",
              "is_middle_entity": false
            }
          ],
          "lawyer": [
            {
              "question": "What did the lawyer do?",
              "answer": "rule against the mailman",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "Who photographed the lawyer?",
              "answer": "the judge",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was photographed do?",
              "answer": "ruled against the mailman",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the lawyer's action?",
              "answer": "the firefighter delivering mail to the teacher which led to the teacher rescuing the photographer which led to the photographer grading the judge which led to the judge photographing the lawyer",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the lawyer's involvement?",
              "answer": "the mailman objected to the statement",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "lawyer",
              "is_middle_entity": false
            }
          ],
          "judge": [
            {
              "question": "What did the judge do?",
              "answer": "photograph the lawyer",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "judge",
              "is_middle_entity": true
            },
            {
              "question": "Who graded the judge?",
              "answer": "the photographer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "judge",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "judge",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was graded do?",
              "answer": "photographed the lawyer",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "judge",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the judge's action?",
              "answer": "the firefighter delivering mail to the teacher which led to the teacher rescuing the photographer which led to the photographer grading the judge",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "judge",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the judge's involvement?",
              "answer": "the lawyer ruled against the mailman",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "judge",
              "is_middle_entity": true
            }
          ],
          "photographer": [
            {
              "question": "What did the photographer do?",
              "answer": "grade the judge",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "Who rescued the photographer?",
              "answer": "the teacher",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was rescued do?",
              "answer": "graded the judge",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the photographer's action?",
              "answer": "the firefighter delivering mail to the teacher which led to the teacher rescuing the photographer",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the photographer's involvement?",
              "answer": "the judge photographed the lawyer",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "photographer",
              "is_middle_entity": false
            }
          ],
          "firefighter": [
            {
              "question": "What did the firefighter do?",
              "answer": "deliver mail to the teacher",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "Who was affected by the firefighter?",
              "answer": "the teacher",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the firefighter do?",
              "answer": "rescued the photographer",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the firefighter's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the firefighter's involvement?",
              "answer": "the teacher rescued the photographer",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "firefighter",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 36
      },
      {
        "id": "complexity_5_sentence_2",
        "sentence": "The frog that the camel that the butterfly that the tuna that the lizard that the spider croaked at crawled toward basked toward schooled with fluttered toward humped.",
        "structure": [
          {
            "subject": "frog",
            "action": "humped",
            "object": null
          },
          {
            "subject": "camel",
            "action": "fluttered toward",
            "object": "frog"
          },
          {
            "subject": "butterfly",
            "action": "schooled with",
            "object": "camel"
          },
          {
            "subject": "tuna",
            "action": "basked toward",
            "object": "butterfly"
          },
          {
            "subject": "lizard",
            "action": "crawled toward",
            "object": "tuna"
          },
          {
            "subject": "spider",
            "action": "croaked at",
            "object": "lizard"
          }
        ],
        "middle_entity": "butterfly",
        "all_entities": [
          "lizard",
          "butterfly",
          "spider",
          "camel",
          "tuna",
          "frog"
        ],
        "questions_by_entity": {
          "lizard": [
            {
              "question": "What did the lizard do?",
              "answer": "crawl toward the tuna",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "lizard",
              "is_middle_entity": false
            },
            {
              "question": "What croaked at the lizard?",
              "answer": "the spider",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "lizard",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "lizard",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was croaked at do?",
              "answer": "crawled toward the tuna",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "lizard",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the lizard's action?",
              "answer": "the spider croaking at the lizard",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "lizard",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the lizard's involvement?",
              "answer": "the tuna basked toward the butterfly",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "lizard",
              "is_middle_entity": false
            }
          ],
          "butterfly": [
            {
              "question": "What did the butterfly do?",
              "answer": "school with the camel",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "butterfly",
              "is_middle_entity": true
            },
            {
              "question": "What basked toward the butterfly?",
              "answer": "the tuna",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "butterfly",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "butterfly",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was basked toward do?",
              "answer": "schooled with the camel",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "butterfly",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the butterfly's action?",
              "answer": "the spider croaking at the lizard which led to the lizard crawling toward the tuna which led to the tuna basking toward the butterfly",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "butterfly",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the butterfly's involvement?",
              "answer": "the camel fluttered toward the frog",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "butterfly",
              "is_middle_entity": true
            }
          ],
          "spider": [
            {
              "question": "What did the spider do?",
              "answer": "croak at the lizard",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "spider",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the spider?",
              "answer": "the lizard",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "spider",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "spider",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the spider do?",
              "answer": "crawled toward the tuna",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "spider",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the spider's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "spider",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the spider's involvement?",
              "answer": "the lizard crawled toward the tuna",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "spider",
              "is_middle_entity": false
            }
          ],
          "camel": [
            {
              "question": "What did the camel do?",
              "answer": "flutter toward the frog",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "camel",
              "is_middle_entity": false
            },
            {
              "question": "What schooled with the camel?",
              "answer": "the butterfly",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "camel",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "camel",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was schooled with do?",
              "answer": "fluttered toward the frog",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "camel",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the camel's action?",
              "answer": "the spider croaking at the lizard which led to the lizard crawling toward the tuna which led to the tuna basking toward the butterfly which led to the butterfly schooling with the camel",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "camel",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the camel's involvement?",
              "answer": "the frog humped",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "camel",
              "is_middle_entity": false
            }
          ],
          "tuna": [
            {
              "question": "What did the tuna do?",
              "answer": "bask toward the butterfly",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "tuna",
              "is_middle_entity": false
            },
            {
              "question": "What crawled toward the tuna?",
              "answer": "the lizard",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "tuna",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "tuna",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was crawled toward do?",
              "answer": "basked toward the butterfly",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "tuna",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the tuna's action?",
              "answer": "the spider croaking at the lizard which led to the lizard crawling toward the tuna",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "tuna",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the tuna's involvement?",
              "answer": "the butterfly schooled with the camel",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "tuna",
              "is_middle_entity": false
            }
          ],
          "frog": [
            {
              "question": "What did the frog do?",
              "answer": "hump",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "frog",
              "is_middle_entity": false
            },
            {
              "question": "What fluttered toward the frog?",
              "answer": "the camel",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "frog",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "frog",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was fluttered toward do?",
              "answer": "humped",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "frog",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the frog's action?",
              "answer": "the spider croaking at the lizard which led to the lizard crawling toward the tuna which led to the tuna basking toward the butterfly which led to the butterfly schooling with the camel which led to the camel fluttering toward the frog",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "frog",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the frog's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "frog",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 36
      },
      {
        "id": "complexity_5_sentence_3",
        "sentence": "The lawyer that the photographer that the firefighter that the judge that the waiter that the police officer subpoenaed arrested took food orders from ruled against rescued photographed.",
        "structure": [
          {
            "subject": "lawyer",
            "action": "photographed",
            "object": null
          },
          {
            "subject": "photographer",
            "action": "rescued",
            "object": "lawyer"
          },
          {
            "subject": "firefighter",
            "action": "ruled against",
            "object": "photographer"
          },
          {
            "subject": "judge",
            "action": "took food orders from",
            "object": "firefighter"
          },
          {
            "subject": "waiter",
            "action": "arrested",
            "object": "judge"
          },
          {
            "subject": "police officer",
            "action": "subpoenaed",
            "object": "waiter"
          }
        ],
        "middle_entity": "firefighter",
        "all_entities": [
          "lawyer",
          "waiter",
          "police officer",
          "judge",
          "photographer",
          "firefighter"
        ],
        "questions_by_entity": {
          "lawyer": [
            {
              "question": "What did the lawyer do?",
              "answer": "photograph",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "Who rescued the lawyer?",
              "answer": "the photographer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was rescued do?",
              "answer": "photographed",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the lawyer's action?",
              "answer": "the police officer subpoenaing the waiter which led to the waiter arresting the judge which led to the judge taking food orders from the firefighter which led to the firefighter ruling against the photographer which led to the photographer rescuing the lawyer",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the lawyer's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "lawyer",
              "is_middle_entity": false
            }
          ],
          "waiter": [
            {
              "question": "What did the waiter do?",
              "answer": "arrest the judge",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "Who subpoenaed the waiter?",
              "answer": "the police officer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was subpoenaed do?",
              "answer": "arrested the judge",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the waiter's action?",
              "answer": "the police officer subpoenaing the waiter",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the waiter's involvement?",
              "answer": "the judge took food orders from the firefighter",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "waiter",
              "is_middle_entity": false
            }
          ],
          "police officer": [
            {
              "question": "What did the police officer do?",
              "answer": "subpoena the waiter",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "Who was affected by the police officer?",
              "answer": "the waiter",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the police officer do?",
              "answer": "arrested the judge",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the police officer's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the police officer's involvement?",
              "answer": "the waiter arrested the judge",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "police officer",
              "is_middle_entity": false
            }
          ],
          "judge": [
            {
              "question": "What did the judge do?",
              "answer": "take food orders from the firefighter",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "Who arrested the judge?",
              "answer": "the waiter",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was arrested do?",
              "answer": "took food orders from the firefighter",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the judge's action?",
              "answer": "the police officer subpoenaing the waiter which led to the waiter arresting the judge",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the judge's involvement?",
              "answer": "the firefighter ruled against the photographer",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "judge",
              "is_middle_entity": false
            }
          ],
          "photographer": [
            {
              "question": "What did the photographer do?",
              "answer": "rescue the lawyer",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "Who ruled against the photographer?",
              "answer": "the firefighter",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was ruled against do?",
              "answer": "rescued the lawyer",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the photographer's action?",
              "answer": "the police officer subpoenaing the waiter which led to the waiter arresting the judge which led to the judge taking food orders from the firefighter which led to the firefighter ruling against the photographer",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the photographer's involvement?",
              "answer": "the lawyer photographed",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "photographer",
              "is_middle_entity": false
            }
          ],
          "firefighter": [
            {
              "question": "What did the firefighter do?",
              "answer": "rule against the photographer",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "firefighter",
              "is_middle_entity": true
            },
            {
              "question": "Who took food orders from the firefighter?",
              "answer": "the judge",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "firefighter",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "firefighter",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity whose order was taken do?",
              "answer": "ruled against the photographer",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "firefighter",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the firefighter's action?",
              "answer": "the police officer subpoenaing the waiter which led to the waiter arresting the judge which led to the judge taking food orders from the firefighter",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "firefighter",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the firefighter's involvement?",
              "answer": "the photographer rescued the lawyer",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "firefighter",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 36
      },
      {
        "id": "complexity_5_sentence_4",
        "sentence": "The mailman that the photographer that the doctor that the surgeon that the firefighter that the teacher delivered mail to graded rescued operated on prescribed medicine to photographed.",
        "structure": [
          {
            "subject": "mailman",
            "action": "photographed",
            "object": null
          },
          {
            "subject": "photographer",
            "action": "prescribed medicine to",
            "object": "mailman"
          },
          {
            "subject": "doctor",
            "action": "operated on",
            "object": "photographer"
          },
          {
            "subject": "surgeon",
            "action": "rescued",
            "object": "doctor"
          },
          {
            "subject": "firefighter",
            "action": "graded",
            "object": "surgeon"
          },
          {
            "subject": "teacher",
            "action": "delivered mail to",
            "object": "firefighter"
          }
        ],
        "middle_entity": "doctor",
        "all_entities": [
          "mailman",
          "doctor",
          "teacher",
          "surgeon",
          "photographer",
          "firefighter"
        ],
        "questions_by_entity": {
          "mailman": [
            {
              "question": "What did the mailman do?",
              "answer": "photograph",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "Who prescribed medicine to the mailman?",
              "answer": "the photographer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was prescribed medicine to do?",
              "answer": "photographed",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the mailman's action?",
              "answer": "the teacher delivering mail to the firefighter which led to the firefighter grading the surgeon which led to the surgeon rescuing the doctor which led to the doctor operating on the photographer which led to the photographer prescribing medicine to the mailman",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the mailman's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "mailman",
              "is_middle_entity": false
            }
          ],
          "doctor": [
            {
              "question": "What did the doctor do?",
              "answer": "operate on the photographer",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "doctor",
              "is_middle_entity": true
            },
            {
              "question": "Who rescued the doctor?",
              "answer": "the surgeon",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "doctor",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "doctor",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was rescued do?",
              "answer": "operated on the photographer",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "doctor",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the doctor's action?",
              "answer": "the teacher delivering mail to the firefighter which led to the firefighter grading the surgeon which led to the surgeon rescuing the doctor",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "doctor",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the doctor's involvement?",
              "answer": "the photographer prescribed medicine to the mailman",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "doctor",
              "is_middle_entity": true
            }
          ],
          "teacher": [
            {
              "question": "What did the teacher do?",
              "answer": "deliver mail to the firefighter",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "Who was affected by the teacher?",
              "answer": "the firefighter",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the teacher do?",
              "answer": "graded the surgeon",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the teacher's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the teacher's involvement?",
              "answer": "the firefighter graded the surgeon",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "teacher",
              "is_middle_entity": false
            }
          ],
          "surgeon": [
            {
              "question": "What did the surgeon do?",
              "answer": "rescue the doctor",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "Who graded the surgeon?",
              "answer": "the firefighter",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was graded do?",
              "answer": "rescued the doctor",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the surgeon's action?",
              "answer": "the teacher delivering mail to the firefighter which led to the firefighter grading the surgeon",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the surgeon's involvement?",
              "answer": "the doctor operated on the photographer",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "surgeon",
              "is_middle_entity": false
            }
          ],
          "photographer": [
            {
              "question": "What did the photographer do?",
              "answer": "prescribe medicine to the mailman",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "Who operated on the photographer?",
              "answer": "the doctor",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was operated on do?",
              "answer": "prescribed medicine to the mailman",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the photographer's action?",
              "answer": "the teacher delivering mail to the firefighter which led to the firefighter grading the surgeon which led to the surgeon rescuing the doctor which led to the doctor operating on the photographer",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the photographer's involvement?",
              "answer": "the mailman photographed",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "photographer",
              "is_middle_entity": false
            }
          ],
          "firefighter": [
            {
              "question": "What did the firefighter do?",
              "answer": "grade the surgeon",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "Who delivered mail to the firefighter?",
              "answer": "the teacher",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was delivered mail to do?",
              "answer": "graded the surgeon",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the firefighter's action?",
              "answer": "the teacher delivering mail to the firefighter",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the firefighter's involvement?",
              "answer": "the surgeon rescued the doctor",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "firefighter",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 36
      },
      {
        "id": "complexity_5_sentence_5",
        "sentence": "The parrot that the beaver that the dolphin that the moose that the vulture that the tuna mimicked swam toward scavenged from bellowed at clicked at slapped.",
        "structure": [
          {
            "subject": "parrot",
            "action": "slapped",
            "object": null
          },
          {
            "subject": "beaver",
            "action": "clicked at",
            "object": "parrot"
          },
          {
            "subject": "dolphin",
            "action": "bellowed at",
            "object": "beaver"
          },
          {
            "subject": "moose",
            "action": "scavenged from",
            "object": "dolphin"
          },
          {
            "subject": "vulture",
            "action": "swam toward",
            "object": "moose"
          },
          {
            "subject": "tuna",
            "action": "mimicked",
            "object": "vulture"
          }
        ],
        "middle_entity": "dolphin",
        "all_entities": [
          "parrot",
          "beaver",
          "vulture",
          "dolphin",
          "tuna",
          "moose"
        ],
        "questions_by_entity": {
          "parrot": [
            {
              "question": "What did the parrot do?",
              "answer": "slap",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "parrot",
              "is_middle_entity": false
            },
            {
              "question": "What clicked at the parrot?",
              "answer": "the beaver",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "parrot",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "parrot",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was clicked at do?",
              "answer": "slapped",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "parrot",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the parrot's action?",
              "answer": "the tuna mimicking the vulture which led to the vulture swimming toward the moose which led to the moose scavenging from the dolphin which led to the dolphin bellowing at the beaver which led to the beaver clicking at the parrot",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "parrot",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the parrot's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "parrot",
              "is_middle_entity": false
            }
          ],
          "beaver": [
            {
              "question": "What did the beaver do?",
              "answer": "click at the parrot",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "beaver",
              "is_middle_entity": false
            },
            {
              "question": "What bellowed at the beaver?",
              "answer": "the dolphin",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "beaver",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "beaver",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was bellowed at do?",
              "answer": "clicked at the parrot",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "beaver",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the beaver's action?",
              "answer": "the tuna mimicking the vulture which led to the vulture swimming toward the moose which led to the moose scavenging from the dolphin which led to the dolphin bellowing at the beaver",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "beaver",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the beaver's involvement?",
              "answer": "the parrot slapped",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "beaver",
              "is_middle_entity": false
            }
          ],
          "vulture": [
            {
              "question": "What did the vulture do?",
              "answer": "swim toward the moose",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "vulture",
              "is_middle_entity": false
            },
            {
              "question": "What mimicked the vulture?",
              "answer": "the tuna",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "vulture",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "vulture",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was mimicked do?",
              "answer": "swum toward the moose",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "vulture",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the vulture's action?",
              "answer": "the tuna mimicking the vulture",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "vulture",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the vulture's involvement?",
              "answer": "the moose scavenged from the dolphin",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "vulture",
              "is_middle_entity": false
            }
          ],
          "dolphin": [
            {
              "question": "What did the dolphin do?",
              "answer": "bellow at the beaver",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "dolphin",
              "is_middle_entity": true
            },
            {
              "question": "What scavenged from the dolphin?",
              "answer": "the moose",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "dolphin",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "dolphin",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was scavenged from do?",
              "answer": "bellowed at the beaver",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "dolphin",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the dolphin's action?",
              "answer": "the tuna mimicking the vulture which led to the vulture swimming toward the moose which led to the moose scavenging from the dolphin",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "dolphin",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the dolphin's involvement?",
              "answer": "the beaver clicked at the parrot",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "dolphin",
              "is_middle_entity": true
            }
          ],
          "tuna": [
            {
              "question": "What did the tuna do?",
              "answer": "mimic the vulture",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "tuna",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the tuna?",
              "answer": "the vulture",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "tuna",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "tuna",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the tuna do?",
              "answer": "swum toward the moose",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "tuna",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the tuna's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "tuna",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the tuna's involvement?",
              "answer": "the vulture swam toward the moose",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "tuna",
              "is_middle_entity": false
            }
          ],
          "moose": [
            {
              "question": "What did the moose do?",
              "answer": "scavenge from the dolphin",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "moose",
              "is_middle_entity": false
            },
            {
              "question": "What swam toward the moose?",
              "answer": "the vulture",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "moose",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "moose",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was swum toward do?",
              "answer": "scavenged from the dolphin",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "moose",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the moose's action?",
              "answer": "the tuna mimicking the vulture which led to the vulture swimming toward the moose",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "moose",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the moose's involvement?",
              "answer": "the dolphin bellowed at the beaver",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "moose",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 36
      },
      {
        "id": "complexity_5_sentence_6",
        "sentence": "The truck that the spaceship that the airplane that the motorcycle that the bicycle that the boat jackknifed into sailed past cycled around lane-split past air-dropped on launched.",
        "structure": [
          {
            "subject": "truck",
            "action": "launched",
            "object": null
          },
          {
            "subject": "spaceship",
            "action": "air-dropped on",
            "object": "truck"
          },
          {
            "subject": "airplane",
            "action": "lane-split past",
            "object": "spaceship"
          },
          {
            "subject": "motorcycle",
            "action": "cycled around",
            "object": "airplane"
          },
          {
            "subject": "bicycle",
            "action": "sailed past",
            "object": "motorcycle"
          },
          {
            "subject": "boat",
            "action": "jackknifed into",
            "object": "bicycle"
          }
        ],
        "middle_entity": "airplane",
        "all_entities": [
          "airplane",
          "boat",
          "bicycle",
          "truck",
          "motorcycle",
          "spaceship"
        ],
        "questions_by_entity": {
          "airplane": [
            {
              "question": "What did the airplane do?",
              "answer": "lane-split past the spaceship",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": true
            },
            {
              "question": "What cycled around the airplane?",
              "answer": "the motorcycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was cycled around do?",
              "answer": "lane-split past the spaceship",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the airplane's action?",
              "answer": "the boat jackknifing into the bicycle which led to the bicycle sailing past the motorcycle which led to the motorcycle cycling around the airplane",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the airplane's involvement?",
              "answer": "the spaceship air-dropped on the truck",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": true
            }
          ],
          "boat": [
            {
              "question": "What did the boat do?",
              "answer": "jackknife into the bicycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the boat?",
              "answer": "the bicycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the boat do?",
              "answer": "sailed past the motorcycle",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the boat's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the boat's involvement?",
              "answer": "the bicycle sailed past the motorcycle",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            }
          ],
          "bicycle": [
            {
              "question": "What did the bicycle do?",
              "answer": "sail past the motorcycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What jackknifed into the bicycle?",
              "answer": "the boat",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was jackknifed into do?",
              "answer": "sailed past the motorcycle",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the bicycle's action?",
              "answer": "the boat jackknifing into the bicycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the bicycle's involvement?",
              "answer": "the motorcycle cycled around the airplane",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": false
            }
          ],
          "truck": [
            {
              "question": "What did the truck do?",
              "answer": "launch",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What air-dropped on the truck?",
              "answer": "the spaceship",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was air-dropped on do?",
              "answer": "launched",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the truck's action?",
              "answer": "the boat jackknifing into the bicycle which led to the bicycle sailing past the motorcycle which led to the motorcycle cycling around the airplane which led to the airplane lane-splitting past the spaceship which led to the spaceship air-dropping on the truck",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the truck's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            }
          ],
          "motorcycle": [
            {
              "question": "What did the motorcycle do?",
              "answer": "cycle around the airplane",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What sailed past the motorcycle?",
              "answer": "the bicycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was sailed past do?",
              "answer": "cycled around the airplane",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the motorcycle's action?",
              "answer": "the boat jackknifing into the bicycle which led to the bicycle sailing past the motorcycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the motorcycle's involvement?",
              "answer": "the airplane lane-split past the spaceship",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": false
            }
          ],
          "spaceship": [
            {
              "question": "What did the spaceship do?",
              "answer": "air-drop on the truck",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What lane-split past the spaceship?",
              "answer": "the airplane",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was lane-split past do?",
              "answer": "air-dropped on the truck",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the spaceship's action?",
              "answer": "the boat jackknifing into the bicycle which led to the bicycle sailing past the motorcycle which led to the motorcycle cycling around the airplane which led to the airplane lane-splitting past the spaceship",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the spaceship's involvement?",
              "answer": "the truck launched",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 36
      },
      {
        "id": "complexity_5_sentence_7",
        "sentence": "The cat that the worm that the coyote that the vulture that the skunk that the camel purred at spat at sprayed at scavenged from yipped at burrowed.",
        "structure": [
          {
            "subject": "cat",
            "action": "burrowed",
            "object": null
          },
          {
            "subject": "worm",
            "action": "yipped at",
            "object": "cat"
          },
          {
            "subject": "coyote",
            "action": "scavenged from",
            "object": "worm"
          },
          {
            "subject": "vulture",
            "action": "sprayed at",
            "object": "coyote"
          },
          {
            "subject": "skunk",
            "action": "spat at",
            "object": "vulture"
          },
          {
            "subject": "camel",
            "action": "purred at",
            "object": "skunk"
          }
        ],
        "middle_entity": "coyote",
        "all_entities": [
          "worm",
          "cat",
          "camel",
          "coyote",
          "skunk",
          "vulture"
        ],
        "questions_by_entity": {
          "worm": [
            {
              "question": "What did the worm do?",
              "answer": "yip at the cat",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "worm",
              "is_middle_entity": false
            },
            {
              "question": "What scavenged from the worm?",
              "answer": "the coyote",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "worm",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "worm",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was scavenged from do?",
              "answer": "yipped at the cat",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "worm",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the worm's action?",
              "answer": "the camel purring at the skunk which led to the skunk spitting at the vulture which led to the vulture spraying at the coyote which led to the coyote scavenging from the worm",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "worm",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the worm's involvement?",
              "answer": "the cat burrowed",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "worm",
              "is_middle_entity": false
            }
          ],
          "cat": [
            {
              "question": "What did the cat do?",
              "answer": "burrow",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "cat",
              "is_middle_entity": false
            },
            {
              "question": "What yipped at the cat?",
              "answer": "the worm",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "cat",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "cat",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was yipped at do?",
              "answer": "burrowed",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "cat",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the cat's action?",
              "answer": "the camel purring at the skunk which led to the skunk spitting at the vulture which led to the vulture spraying at the coyote which led to the coyote scavenging from the worm which led to the worm yipping at the cat",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "cat",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the cat's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "cat",
              "is_middle_entity": false
            }
          ],
          "camel": [
            {
              "question": "What did the camel do?",
              "answer": "purr at the skunk",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "camel",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the camel?",
              "answer": "the skunk",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "camel",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "camel",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the camel do?",
              "answer": "spat at the vulture",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "camel",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the camel's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "camel",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the camel's involvement?",
              "answer": "the skunk spat at the vulture",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "camel",
              "is_middle_entity": false
            }
          ],
          "coyote": [
            {
              "question": "What did the coyote do?",
              "answer": "scavenge from the worm",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "coyote",
              "is_middle_entity": true
            },
            {
              "question": "What sprayed at the coyote?",
              "answer": "the vulture",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "coyote",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "coyote",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was sprayed at do?",
              "answer": "scavenged from the worm",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "coyote",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the coyote's action?",
              "answer": "the camel purring at the skunk which led to the skunk spitting at the vulture which led to the vulture spraying at the coyote",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "coyote",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the coyote's involvement?",
              "answer": "the worm yipped at the cat",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "coyote",
              "is_middle_entity": true
            }
          ],
          "skunk": [
            {
              "question": "What did the skunk do?",
              "answer": "spit at the vulture",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "skunk",
              "is_middle_entity": false
            },
            {
              "question": "What purred at the skunk?",
              "answer": "the camel",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "skunk",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "skunk",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was purred at do?",
              "answer": "spat at the vulture",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "skunk",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the skunk's action?",
              "answer": "the camel purring at the skunk",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "skunk",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the skunk's involvement?",
              "answer": "the vulture sprayed at the coyote",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "skunk",
              "is_middle_entity": false
            }
          ],
          "vulture": [
            {
              "question": "What did the vulture do?",
              "answer": "spray at the coyote",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "vulture",
              "is_middle_entity": false
            },
            {
              "question": "What spat at the vulture?",
              "answer": "the skunk",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "vulture",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "vulture",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was spat at do?",
              "answer": "sprayed at the coyote",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "vulture",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the vulture's action?",
              "answer": "the camel purring at the skunk which led to the skunk spitting at the vulture",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "vulture",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the vulture's involvement?",
              "answer": "the coyote scavenged from the worm",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "vulture",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 36
      },
      {
        "id": "complexity_5_sentence_8",
        "sentence": "The whale that the cobra that the starfish that the giraffe that the bee that the octopus spouted at squeezed buzzed at stretched toward crawled toward hissed.",
        "structure": [
          {
            "subject": "whale",
            "action": "hissed",
            "object": null
          },
          {
            "subject": "cobra",
            "action": "crawled toward",
            "object": "whale"
          },
          {
            "subject": "starfish",
            "action": "stretched toward",
            "object": "cobra"
          },
          {
            "subject": "giraffe",
            "action": "buzzed at",
            "object": "starfish"
          },
          {
            "subject": "bee",
            "action": "squeezed",
            "object": "giraffe"
          },
          {
            "subject": "octopus",
            "action": "spouted at",
            "object": "bee"
          }
        ],
        "middle_entity": "starfish",
        "all_entities": [
          "cobra",
          "bee",
          "starfish",
          "octopus",
          "whale",
          "giraffe"
        ],
        "questions_by_entity": {
          "cobra": [
            {
              "question": "What did the cobra do?",
              "answer": "crawl toward the whale",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "cobra",
              "is_middle_entity": false
            },
            {
              "question": "What stretched toward the cobra?",
              "answer": "the starfish",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "cobra",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "cobra",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was stretched toward do?",
              "answer": "crawled toward the whale",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "cobra",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the cobra's action?",
              "answer": "the octopus spouting at the bee which led to the bee squeezing the giraffe which led to the giraffe buzzing at the starfish which led to the starfish stretching toward the cobra",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "cobra",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the cobra's involvement?",
              "answer": "the whale hissed",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "cobra",
              "is_middle_entity": false
            }
          ],
          "bee": [
            {
              "question": "What did the bee do?",
              "answer": "squeeze the giraffe",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "bee",
              "is_middle_entity": false
            },
            {
              "question": "What spouted at the bee?",
              "answer": "the octopus",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "bee",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "bee",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was spouted at do?",
              "answer": "squeezed the giraffe",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "bee",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the bee's action?",
              "answer": "the octopus spouting at the bee",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "bee",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the bee's involvement?",
              "answer": "the giraffe buzzed at the starfish",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "bee",
              "is_middle_entity": false
            }
          ],
          "starfish": [
            {
              "question": "What did the starfish do?",
              "answer": "stretch toward the cobra",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "starfish",
              "is_middle_entity": true
            },
            {
              "question": "What buzzed at the starfish?",
              "answer": "the giraffe",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "starfish",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "starfish",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was buzzed at do?",
              "answer": "stretched toward the cobra",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "starfish",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the starfish's action?",
              "answer": "the octopus spouting at the bee which led to the bee squeezing the giraffe which led to the giraffe buzzing at the starfish",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "starfish",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the starfish's involvement?",
              "answer": "the cobra crawled toward the whale",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "starfish",
              "is_middle_entity": true
            }
          ],
          "octopus": [
            {
              "question": "What did the octopus do?",
              "answer": "spout at the bee",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "octopus",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the octopus?",
              "answer": "the bee",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "octopus",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "octopus",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the octopus do?",
              "answer": "squeezed the giraffe",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "octopus",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the octopus's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "octopus",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the octopus's involvement?",
              "answer": "the bee squeezed the giraffe",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "octopus",
              "is_middle_entity": false
            }
          ],
          "whale": [
            {
              "question": "What did the whale do?",
              "answer": "hiss",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "whale",
              "is_middle_entity": false
            },
            {
              "question": "What crawled toward the whale?",
              "answer": "the cobra",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "whale",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "whale",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was crawled toward do?",
              "answer": "hissed",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "whale",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the whale's action?",
              "answer": "the octopus spouting at the bee which led to the bee squeezing the giraffe which led to the giraffe buzzing at the starfish which led to the starfish stretching toward the cobra which led to the cobra crawling toward the whale",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "whale",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the whale's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "whale",
              "is_middle_entity": false
            }
          ],
          "giraffe": [
            {
              "question": "What did the giraffe do?",
              "answer": "buzz at the starfish",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "giraffe",
              "is_middle_entity": false
            },
            {
              "question": "What squeezed the giraffe?",
              "answer": "the bee",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "giraffe",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "giraffe",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was squeezed do?",
              "answer": "buzzed at the starfish",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "giraffe",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the giraffe's action?",
              "answer": "the octopus spouting at the bee which led to the bee squeezing the giraffe",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "giraffe",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the giraffe's involvement?",
              "answer": "the starfish stretched toward the cobra",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "giraffe",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 36
      },
      {
        "id": "complexity_5_sentence_9",
        "sentence": "The surgeon that the police officer that the judge that the teacher that the photographer that the nurse sutured took the temperature of photographed graded gaveled patrolled.",
        "structure": [
          {
            "subject": "surgeon",
            "action": "patrolled",
            "object": null
          },
          {
            "subject": "police officer",
            "action": "gaveled",
            "object": "surgeon"
          },
          {
            "subject": "judge",
            "action": "graded",
            "object": "police officer"
          },
          {
            "subject": "teacher",
            "action": "photographed",
            "object": "judge"
          },
          {
            "subject": "photographer",
            "action": "took the temperature of",
            "object": "teacher"
          },
          {
            "subject": "nurse",
            "action": "sutured",
            "object": "photographer"
          }
        ],
        "middle_entity": "judge",
        "all_entities": [
          "teacher",
          "police officer",
          "judge",
          "photographer",
          "surgeon",
          "nurse"
        ],
        "questions_by_entity": {
          "teacher": [
            {
              "question": "What did the teacher do?",
              "answer": "photograph the judge",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "Who took the temperature of the teacher?",
              "answer": "the photographer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity whose temperature was taken do?",
              "answer": "photographed the judge",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the teacher's action?",
              "answer": "the nurse suturing the photographer which led to the photographer taking the temperature of the teacher",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the teacher's involvement?",
              "answer": "the judge graded the police officer",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "teacher",
              "is_middle_entity": false
            }
          ],
          "police officer": [
            {
              "question": "What did the police officer do?",
              "answer": "gavel the surgeon",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "Who graded the police officer?",
              "answer": "the judge",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was graded do?",
              "answer": "gaveled the surgeon",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the police officer's action?",
              "answer": "the nurse suturing the photographer which led to the photographer taking the temperature of the teacher which led to the teacher photographing the judge which led to the judge grading the police officer",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the police officer's involvement?",
              "answer": "the surgeon patrolled",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "police officer",
              "is_middle_entity": false
            }
          ],
          "judge": [
            {
              "question": "What did the judge do?",
              "answer": "grade the police officer",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "judge",
              "is_middle_entity": true
            },
            {
              "question": "Who photographed the judge?",
              "answer": "the teacher",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "judge",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "judge",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was photographed do?",
              "answer": "graded the police officer",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "judge",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the judge's action?",
              "answer": "the nurse suturing the photographer which led to the photographer taking the temperature of the teacher which led to the teacher photographing the judge",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "judge",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the judge's involvement?",
              "answer": "the police officer gaveled the surgeon",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "judge",
              "is_middle_entity": true
            }
          ],
          "photographer": [
            {
              "question": "What did the photographer do?",
              "answer": "take the temperature of the teacher",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "Who sutured the photographer?",
              "answer": "the nurse",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was sutured do?",
              "answer": "took the temperature of the teacher",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the photographer's action?",
              "answer": "the nurse suturing the photographer",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the photographer's involvement?",
              "answer": "the teacher photographed the judge",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "photographer",
              "is_middle_entity": false
            }
          ],
          "surgeon": [
            {
              "question": "What did the surgeon do?",
              "answer": "patrol",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "Who gaveled the surgeon?",
              "answer": "the police officer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was gaveled do?",
              "answer": "patrolled",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the surgeon's action?",
              "answer": "the nurse suturing the photographer which led to the photographer taking the temperature of the teacher which led to the teacher photographing the judge which led to the judge grading the police officer which led to the police officer gaveling the surgeon",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the surgeon's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "surgeon",
              "is_middle_entity": false
            }
          ],
          "nurse": [
            {
              "question": "What did the nurse do?",
              "answer": "suture the photographer",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "Who was affected by the nurse?",
              "answer": "the photographer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the nurse do?",
              "answer": "took the temperature of the teacher",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the nurse's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the nurse's involvement?",
              "answer": "the photographer took the temperature of the teacher",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "nurse",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 36
      },
      {
        "id": "complexity_5_sentence_10",
        "sentence": "The worm that the duck that the dolphin that the bee that the starfish that the spider wriggled toward crawled toward crawled toward buzzed at clicked at dabbled peacefully.",
        "structure": [
          {
            "subject": "worm",
            "action": "dabbled peacefully",
            "object": null
          },
          {
            "subject": "duck",
            "action": "clicked at",
            "object": "worm"
          },
          {
            "subject": "dolphin",
            "action": "buzzed at",
            "object": "duck"
          },
          {
            "subject": "bee",
            "action": "crawled toward",
            "object": "dolphin"
          },
          {
            "subject": "starfish",
            "action": "crawled toward",
            "object": "bee"
          },
          {
            "subject": "spider",
            "action": "wriggled toward",
            "object": "starfish"
          }
        ],
        "middle_entity": "dolphin",
        "all_entities": [
          "worm",
          "bee",
          "starfish",
          "duck",
          "dolphin",
          "spider"
        ],
        "questions_by_entity": {
          "worm": [
            {
              "question": "What did the worm do?",
              "answer": "dabble peacefully",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "worm",
              "is_middle_entity": false
            },
            {
              "question": "What clicked at the worm?",
              "answer": "the duck",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "worm",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "worm",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was clicked at do?",
              "answer": "dabbled peacefully",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "worm",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the worm's action?",
              "answer": "the spider wriggling toward the starfish which led to the starfish crawling toward the bee which led to the bee crawling toward the dolphin which led to the dolphin buzzing at the duck which led to the duck clicking at the worm",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "worm",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the worm's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "worm",
              "is_middle_entity": false
            }
          ],
          "bee": [
            {
              "question": "What did the bee do?",
              "answer": "crawl toward the dolphin",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "bee",
              "is_middle_entity": false
            },
            {
              "question": "What crawled toward the bee?",
              "answer": "the starfish",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "bee",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "bee",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was crawled toward do?",
              "answer": "crawled toward the dolphin",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "bee",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the bee's action?",
              "answer": "the spider wriggling toward the starfish which led to the starfish crawling toward the bee",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "bee",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the bee's involvement?",
              "answer": "the dolphin buzzed at the duck",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "bee",
              "is_middle_entity": false
            }
          ],
          "starfish": [
            {
              "question": "What did the starfish do?",
              "answer": "crawl toward the bee",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "starfish",
              "is_middle_entity": false
            },
            {
              "question": "What wriggled toward the starfish?",
              "answer": "the spider",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "starfish",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "starfish",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was wriggled toward do?",
              "answer": "crawled toward the bee",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "starfish",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the starfish's action?",
              "answer": "the spider wriggling toward the starfish",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "starfish",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the starfish's involvement?",
              "answer": "the bee crawled toward the dolphin",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "starfish",
              "is_middle_entity": false
            }
          ],
          "duck": [
            {
              "question": "What did the duck do?",
              "answer": "click at the worm",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "duck",
              "is_middle_entity": false
            },
            {
              "question": "What buzzed at the duck?",
              "answer": "the dolphin",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "duck",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "duck",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was buzzed at do?",
              "answer": "clicked at the worm",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "duck",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the duck's action?",
              "answer": "the spider wriggling toward the starfish which led to the starfish crawling toward the bee which led to the bee crawling toward the dolphin which led to the dolphin buzzing at the duck",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "duck",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the duck's involvement?",
              "answer": "the worm dabbled peacefully",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "duck",
              "is_middle_entity": false
            }
          ],
          "dolphin": [
            {
              "question": "What did the dolphin do?",
              "answer": "buzz at the duck",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "dolphin",
              "is_middle_entity": true
            },
            {
              "question": "What crawled toward the dolphin?",
              "answer": "the bee",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "dolphin",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "dolphin",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was crawled toward do?",
              "answer": "buzzed at the duck",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "dolphin",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the dolphin's action?",
              "answer": "the spider wriggling toward the starfish which led to the starfish crawling toward the bee which led to the bee crawling toward the dolphin",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "dolphin",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the dolphin's involvement?",
              "answer": "the duck clicked at the worm",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "dolphin",
              "is_middle_entity": true
            }
          ],
          "spider": [
            {
              "question": "What did the spider do?",
              "answer": "wriggle toward the starfish",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "spider",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the spider?",
              "answer": "the starfish",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "spider",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "spider",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the spider do?",
              "answer": "crawled toward the bee",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "spider",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the spider's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "spider",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the spider's involvement?",
              "answer": "the starfish crawled toward the bee",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "spider",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 36
      },
      {
        "id": "complexity_5_sentence_11",
        "sentence": "The bicycle that the truck that the boat that the train that the airplane that the ambulance cycled around blared the siren at air-dropped on whistled at sailed past jackknifed.",
        "structure": [
          {
            "subject": "bicycle",
            "action": "jackknifed",
            "object": null
          },
          {
            "subject": "truck",
            "action": "sailed past",
            "object": "bicycle"
          },
          {
            "subject": "boat",
            "action": "whistled at",
            "object": "truck"
          },
          {
            "subject": "train",
            "action": "air-dropped on",
            "object": "boat"
          },
          {
            "subject": "airplane",
            "action": "blared the siren at",
            "object": "train"
          },
          {
            "subject": "ambulance",
            "action": "cycled around",
            "object": "airplane"
          }
        ],
        "middle_entity": "boat",
        "all_entities": [
          "airplane",
          "ambulance",
          "train",
          "boat",
          "bicycle",
          "truck"
        ],
        "questions_by_entity": {
          "airplane": [
            {
              "question": "What did the airplane do?",
              "answer": "blared the siren at the train",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What cycled around the airplane?",
              "answer": "the ambulance",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was cycled around do?",
              "answer": "blared the siren at the train",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the airplane's action?",
              "answer": "the ambulance cycling around the airplane",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the airplane's involvement?",
              "answer": "the train air-dropped on the boat",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            }
          ],
          "ambulance": [
            {
              "question": "What did the ambulance do?",
              "answer": "cycle around the airplane",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the ambulance?",
              "answer": "the airplane",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the ambulance do?",
              "answer": "blared the siren at the train",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the ambulance's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the ambulance's involvement?",
              "answer": "the airplane blared the siren at the train",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": false
            }
          ],
          "train": [
            {
              "question": "What did the train do?",
              "answer": "air-drop on the boat",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What blared the siren at the train?",
              "answer": "the airplane",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was blared the siren at do?",
              "answer": "air-dropped on the boat",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the train's action?",
              "answer": "the ambulance cycling around the airplane which led to the airplane blaring the siren at the train",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the train's involvement?",
              "answer": "the boat whistled at the truck",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            }
          ],
          "boat": [
            {
              "question": "What did the boat do?",
              "answer": "whistle at the truck",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": true
            },
            {
              "question": "What air-dropped on the boat?",
              "answer": "the train",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was air-dropped on do?",
              "answer": "whistled at the truck",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the boat's action?",
              "answer": "the ambulance cycling around the airplane which led to the airplane blaring the siren at the train which led to the train air-dropping on the boat",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the boat's involvement?",
              "answer": "the truck sailed past the bicycle",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": true
            }
          ],
          "bicycle": [
            {
              "question": "What did the bicycle do?",
              "answer": "jackknife",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What sailed past the bicycle?",
              "answer": "the truck",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was sailed past do?",
              "answer": "jackknifed",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the bicycle's action?",
              "answer": "the ambulance cycling around the airplane which led to the airplane blaring the siren at the train which led to the train air-dropping on the boat which led to the boat whistling at the truck which led to the truck sailing past the bicycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the bicycle's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": false
            }
          ],
          "truck": [
            {
              "question": "What did the truck do?",
              "answer": "sail past the bicycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What whistled at the truck?",
              "answer": "the boat",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was whistled at do?",
              "answer": "sailed past the bicycle",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the truck's action?",
              "answer": "the ambulance cycling around the airplane which led to the airplane blaring the siren at the train which led to the train air-dropping on the boat which led to the boat whistling at the truck",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the truck's involvement?",
              "answer": "the bicycle jackknifed",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 36
      },
      {
        "id": "complexity_5_sentence_12",
        "sentence": "The nurse that the mailman that the judge that the police officer that the principal that the photographer administered shots to shot expelled arrested sentenced sorted mail.",
        "structure": [
          {
            "subject": "nurse",
            "action": "sorted mail",
            "object": null
          },
          {
            "subject": "mailman",
            "action": "sentenced",
            "object": "nurse"
          },
          {
            "subject": "judge",
            "action": "arrested",
            "object": "mailman"
          },
          {
            "subject": "police officer",
            "action": "expelled",
            "object": "judge"
          },
          {
            "subject": "principal",
            "action": "shot",
            "object": "police officer"
          },
          {
            "subject": "photographer",
            "action": "administered shots to",
            "object": "principal"
          }
        ],
        "middle_entity": "judge",
        "all_entities": [
          "principal",
          "mailman",
          "police officer",
          "judge",
          "photographer",
          "nurse"
        ],
        "questions_by_entity": {
          "principal": [
            {
              "question": "What did the principal do?",
              "answer": "shoot the police officer",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "Who administered shots to the principal?",
              "answer": "the photographer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was administered shots do?",
              "answer": "shot the police officer",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the principal's action?",
              "answer": "the photographer administering shots to the principal",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the principal's involvement?",
              "answer": "the police officer expelled the judge",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "principal",
              "is_middle_entity": false
            }
          ],
          "mailman": [
            {
              "question": "What did the mailman do?",
              "answer": "sentence the nurse",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "Who arrested the mailman?",
              "answer": "the judge",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was arrested do?",
              "answer": "sentenced the nurse",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the mailman's action?",
              "answer": "the photographer administering shots to the principal which led to the principal shooting the police officer which led to the police officer expelling the judge which led to the judge arresting the mailman",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the mailman's involvement?",
              "answer": "the nurse sorted mail",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "mailman",
              "is_middle_entity": false
            }
          ],
          "police officer": [
            {
              "question": "What did the police officer do?",
              "answer": "expel the judge",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "Who shot the police officer?",
              "answer": "the principal",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was shot do?",
              "answer": "expelled the judge",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the police officer's action?",
              "answer": "the photographer administering shots to the principal which led to the principal shooting the police officer",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the police officer's involvement?",
              "answer": "the judge arrested the mailman",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "police officer",
              "is_middle_entity": false
            }
          ],
          "judge": [
            {
              "question": "What did the judge do?",
              "answer": "arrest the mailman",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "judge",
              "is_middle_entity": true
            },
            {
              "question": "Who expelled the judge?",
              "answer": "the police officer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "judge",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "judge",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was expelled do?",
              "answer": "arrested the mailman",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "judge",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the judge's action?",
              "answer": "the photographer administering shots to the principal which led to the principal shooting the police officer which led to the police officer expelling the judge",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "judge",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the judge's involvement?",
              "answer": "the mailman sentenced the nurse",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "judge",
              "is_middle_entity": true
            }
          ],
          "photographer": [
            {
              "question": "What did the photographer do?",
              "answer": "administer shots to the principal",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "Who was affected by the photographer?",
              "answer": "the principal",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the photographer do?",
              "answer": "shot the police officer",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the photographer's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the photographer's involvement?",
              "answer": "the principal shot the police officer",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "photographer",
              "is_middle_entity": false
            }
          ],
          "nurse": [
            {
              "question": "What did the nurse do?",
              "answer": "sort mail",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "Who sentenced the nurse?",
              "answer": "the mailman",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was sentenced do?",
              "answer": "sorted mail",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the nurse's action?",
              "answer": "the photographer administering shots to the principal which led to the principal shooting the police officer which led to the police officer expelling the judge which led to the judge arresting the mailman which led to the mailman sentencing the nurse",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the nurse's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "nurse",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 36
      },
      {
        "id": "complexity_5_sentence_13",
        "sentence": "The teacher that the firefighter that the photographer that the mailman that the police officer that the waiter graded seated handcuffed delivered mail to photographed rescued.",
        "structure": [
          {
            "subject": "teacher",
            "action": "rescued",
            "object": null
          },
          {
            "subject": "firefighter",
            "action": "photographed",
            "object": "teacher"
          },
          {
            "subject": "photographer",
            "action": "delivered mail to",
            "object": "firefighter"
          },
          {
            "subject": "mailman",
            "action": "handcuffed",
            "object": "photographer"
          },
          {
            "subject": "police officer",
            "action": "seated",
            "object": "mailman"
          },
          {
            "subject": "waiter",
            "action": "graded",
            "object": "police officer"
          }
        ],
        "middle_entity": "photographer",
        "all_entities": [
          "mailman",
          "teacher",
          "police officer",
          "waiter",
          "photographer",
          "firefighter"
        ],
        "questions_by_entity": {
          "mailman": [
            {
              "question": "What did the mailman do?",
              "answer": "handcuff the photographer",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "Who seated the mailman?",
              "answer": "the police officer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was seated do?",
              "answer": "handcuffed the photographer",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the mailman's action?",
              "answer": "the waiter grading the police officer which led to the police officer seating the mailman",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the mailman's involvement?",
              "answer": "the photographer delivered mail to the firefighter",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "mailman",
              "is_middle_entity": false
            }
          ],
          "teacher": [
            {
              "question": "What did the teacher do?",
              "answer": "rescue",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "Who photographed the teacher?",
              "answer": "the firefighter",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was photographed do?",
              "answer": "rescued",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the teacher's action?",
              "answer": "the waiter grading the police officer which led to the police officer seating the mailman which led to the mailman handcuffing the photographer which led to the photographer delivering mail to the firefighter which led to the firefighter photographing the teacher",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the teacher's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "teacher",
              "is_middle_entity": false
            }
          ],
          "police officer": [
            {
              "question": "What did the police officer do?",
              "answer": "seat the mailman",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "Who graded the police officer?",
              "answer": "the waiter",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was graded do?",
              "answer": "seated the mailman",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the police officer's action?",
              "answer": "the waiter grading the police officer",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the police officer's involvement?",
              "answer": "the mailman handcuffed the photographer",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "police officer",
              "is_middle_entity": false
            }
          ],
          "waiter": [
            {
              "question": "What did the waiter do?",
              "answer": "grade the police officer",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "Who was affected by the waiter?",
              "answer": "the police officer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the waiter do?",
              "answer": "seated the mailman",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the waiter's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the waiter's involvement?",
              "answer": "the police officer seated the mailman",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "waiter",
              "is_middle_entity": false
            }
          ],
          "photographer": [
            {
              "question": "What did the photographer do?",
              "answer": "deliver mail to the firefighter",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "photographer",
              "is_middle_entity": true
            },
            {
              "question": "Who handcuffed the photographer?",
              "answer": "the mailman",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "photographer",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "photographer",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was handcuffed do?",
              "answer": "delivered mail to the firefighter",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "photographer",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the photographer's action?",
              "answer": "the waiter grading the police officer which led to the police officer seating the mailman which led to the mailman handcuffing the photographer",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "photographer",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the photographer's involvement?",
              "answer": "the firefighter photographed the teacher",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "photographer",
              "is_middle_entity": true
            }
          ],
          "firefighter": [
            {
              "question": "What did the firefighter do?",
              "answer": "photograph the teacher",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "Who delivered mail to the firefighter?",
              "answer": "the photographer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was delivered mail do?",
              "answer": "photographed the teacher",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the firefighter's action?",
              "answer": "the waiter grading the police officer which led to the police officer seating the mailman which led to the mailman handcuffing the photographer which led to the photographer delivering mail to the firefighter",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the firefighter's involvement?",
              "answer": "the teacher rescued",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "firefighter",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 36
      },
      {
        "id": "complexity_5_sentence_14",
        "sentence": "The train that the bicycle that the ambulance that the spaceship that the boat that the truck whistled at towed moored to orbited blared the siren at pedaled.",
        "structure": [
          {
            "subject": "train",
            "action": "pedaled",
            "object": null
          },
          {
            "subject": "bicycle",
            "action": "blared the siren at",
            "object": "train"
          },
          {
            "subject": "ambulance",
            "action": "orbited",
            "object": "bicycle"
          },
          {
            "subject": "spaceship",
            "action": "moored to",
            "object": "ambulance"
          },
          {
            "subject": "boat",
            "action": "towed",
            "object": "spaceship"
          },
          {
            "subject": "truck",
            "action": "whistled at",
            "object": "boat"
          }
        ],
        "middle_entity": "ambulance",
        "all_entities": [
          "ambulance",
          "train",
          "boat",
          "bicycle",
          "spaceship",
          "truck"
        ],
        "questions_by_entity": {
          "ambulance": [
            {
              "question": "What did the ambulance do?",
              "answer": "orbit the bicycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": true
            },
            {
              "question": "What moored to the ambulance?",
              "answer": "the spaceship",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was moored do?",
              "answer": "orbited the bicycle",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the ambulance's action?",
              "answer": "the truck whistling at the boat which led to the boat towing the spaceship which led to the spaceship mooring to the ambulance",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the ambulance's involvement?",
              "answer": "the bicycle blared the siren at the train",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": true
            }
          ],
          "train": [
            {
              "question": "What did the train do?",
              "answer": "pedal",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What blared the siren at the train?",
              "answer": "the bicycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was blared the siren at do?",
              "answer": "pedaled",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the train's action?",
              "answer": "the truck whistling at the boat which led to the boat towing the spaceship which led to the spaceship mooring to the ambulance which led to the ambulance orbiting the bicycle which led to the bicycle blaring the siren at the train",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the train's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            }
          ],
          "boat": [
            {
              "question": "What did the boat do?",
              "answer": "tow the spaceship",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What whistled at the boat?",
              "answer": "the truck",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was whistled at do?",
              "answer": "towed the spaceship",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the boat's action?",
              "answer": "the truck whistling at the boat",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the boat's involvement?",
              "answer": "the spaceship moored to the ambulance",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            }
          ],
          "bicycle": [
            {
              "question": "What did the bicycle do?",
              "answer": "blared the siren at the train",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What orbited the bicycle?",
              "answer": "the ambulance",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was orbited do?",
              "answer": "blared the siren at the train",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the bicycle's action?",
              "answer": "the truck whistling at the boat which led to the boat towing the spaceship which led to the spaceship mooring to the ambulance which led to the ambulance orbiting the bicycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the bicycle's involvement?",
              "answer": "the train pedaled",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": false
            }
          ],
          "spaceship": [
            {
              "question": "What did the spaceship do?",
              "answer": "moor to the ambulance",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What towed the spaceship?",
              "answer": "the boat",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was towed do?",
              "answer": "moored to the ambulance",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the spaceship's action?",
              "answer": "the truck whistling at the boat which led to the boat towing the spaceship",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the spaceship's involvement?",
              "answer": "the ambulance orbited the bicycle",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            }
          ],
          "truck": [
            {
              "question": "What did the truck do?",
              "answer": "whistle at the boat",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the truck?",
              "answer": "the boat",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the truck do?",
              "answer": "towed the spaceship",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the truck's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the truck's involvement?",
              "answer": "the boat towed the spaceship",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 36
      },
      {
        "id": "complexity_5_sentence_15",
        "sentence": "The spaceship that the motorcycle that the airplane that the boat that the train that the bicycle orbited cycled around whistled at anchored near air-dropped on wheelied.",
        "structure": [
          {
            "subject": "spaceship",
            "action": "wheelied",
            "object": null
          },
          {
            "subject": "motorcycle",
            "action": "air-dropped on",
            "object": "spaceship"
          },
          {
            "subject": "airplane",
            "action": "anchored near",
            "object": "motorcycle"
          },
          {
            "subject": "boat",
            "action": "whistled at",
            "object": "airplane"
          },
          {
            "subject": "train",
            "action": "cycled around",
            "object": "boat"
          },
          {
            "subject": "bicycle",
            "action": "orbited",
            "object": "train"
          }
        ],
        "middle_entity": "airplane",
        "all_entities": [
          "airplane",
          "train",
          "boat",
          "bicycle",
          "motorcycle",
          "spaceship"
        ],
        "questions_by_entity": {
          "airplane": [
            {
              "question": "What did the airplane do?",
              "answer": "anchor near the motorcycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": true
            },
            {
              "question": "What whistled at the airplane?",
              "answer": "the boat",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was whistled at do?",
              "answer": "anchored near the motorcycle",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the airplane's action?",
              "answer": "the bicycle orbiting the train which led to the train cycling around the boat which led to the boat whistling at the airplane",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the airplane's involvement?",
              "answer": "the motorcycle air-dropped on the spaceship",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": true
            }
          ],
          "train": [
            {
              "question": "What did the train do?",
              "answer": "cycle around the boat",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What orbited the train?",
              "answer": "the bicycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was orbited do?",
              "answer": "cycled around the boat",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the train's action?",
              "answer": "the bicycle orbiting the train",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the train's involvement?",
              "answer": "the boat whistled at the airplane",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            }
          ],
          "boat": [
            {
              "question": "What did the boat do?",
              "answer": "whistle at the airplane",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What cycled around the boat?",
              "answer": "the train",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was cycled around do?",
              "answer": "whistled at the airplane",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the boat's action?",
              "answer": "the bicycle orbiting the train which led to the train cycling around the boat",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the boat's involvement?",
              "answer": "the airplane anchored near the motorcycle",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            }
          ],
          "bicycle": [
            {
              "question": "What did the bicycle do?",
              "answer": "orbit the train",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the bicycle?",
              "answer": "the train",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the bicycle do?",
              "answer": "cycled around the boat",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the bicycle's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the bicycle's involvement?",
              "answer": "the train cycled around the boat",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": false
            }
          ],
          "motorcycle": [
            {
              "question": "What did the motorcycle do?",
              "answer": "air-drop on the spaceship",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What anchored near the motorcycle?",
              "answer": "the airplane",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was anchored near do?",
              "answer": "air-dropped on the spaceship",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the motorcycle's action?",
              "answer": "the bicycle orbiting the train which led to the train cycling around the boat which led to the boat whistling at the airplane which led to the airplane anchoring near the motorcycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the motorcycle's involvement?",
              "answer": "the spaceship wheelied",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": false
            }
          ],
          "spaceship": [
            {
              "question": "What did the spaceship do?",
              "answer": "wheelie",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What air-dropped on the spaceship?",
              "answer": "the motorcycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was air-dropped on do?",
              "answer": "wheelied",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the spaceship's action?",
              "answer": "the bicycle orbiting the train which led to the train cycling around the boat which led to the boat whistling at the airplane which led to the airplane anchoring near the motorcycle which led to the motorcycle air-dropping on the spaceship",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the spaceship's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 36
      },
      {
        "id": "complexity_5_sentence_16",
        "sentence": "The police officer that the surgeon that the mailman that the judge that the photographer that the principal handcuffed expelled shot sentenced delivered mail to sutured.",
        "structure": [
          {
            "subject": "police officer",
            "action": "sutured",
            "object": null
          },
          {
            "subject": "surgeon",
            "action": "delivered mail to",
            "object": "police officer"
          },
          {
            "subject": "mailman",
            "action": "sentenced",
            "object": "surgeon"
          },
          {
            "subject": "judge",
            "action": "shot",
            "object": "mailman"
          },
          {
            "subject": "photographer",
            "action": "expelled",
            "object": "judge"
          },
          {
            "subject": "principal",
            "action": "handcuffed",
            "object": "photographer"
          }
        ],
        "middle_entity": "mailman",
        "all_entities": [
          "principal",
          "mailman",
          "police officer",
          "judge",
          "photographer",
          "surgeon"
        ],
        "questions_by_entity": {
          "principal": [
            {
              "question": "What did the principal do?",
              "answer": "handcuff the photographer",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "Who was affected by the principal?",
              "answer": "the photographer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the principal do?",
              "answer": "expelled the judge",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the principal's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the principal's involvement?",
              "answer": "the photographer expelled the judge",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "principal",
              "is_middle_entity": false
            }
          ],
          "mailman": [
            {
              "question": "What did the mailman do?",
              "answer": "sentence the surgeon",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "mailman",
              "is_middle_entity": true
            },
            {
              "question": "Who shot the mailman?",
              "answer": "the judge",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "mailman",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "mailman",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was shot do?",
              "answer": "sentenced the surgeon",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "mailman",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the mailman's action?",
              "answer": "the principal handcuffing the photographer which led to the photographer expelling the judge which led to the judge shooting the mailman",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "mailman",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the mailman's involvement?",
              "answer": "the surgeon delivered mail to the police officer",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "mailman",
              "is_middle_entity": true
            }
          ],
          "police officer": [
            {
              "question": "What did the police officer do?",
              "answer": "suture",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "Who delivered mail to the police officer?",
              "answer": "the surgeon",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was delivered mail do?",
              "answer": "sutured",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the police officer's action?",
              "answer": "the principal handcuffing the photographer which led to the photographer expelling the judge which led to the judge shooting the mailman which led to the mailman sentencing the surgeon which led to the surgeon delivering mail to the police officer",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the police officer's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "police officer",
              "is_middle_entity": false
            }
          ],
          "judge": [
            {
              "question": "What did the judge do?",
              "answer": "shoot the mailman",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "Who expelled the judge?",
              "answer": "the photographer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was expelled do?",
              "answer": "shot the mailman",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the judge's action?",
              "answer": "the principal handcuffing the photographer which led to the photographer expelling the judge",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the judge's involvement?",
              "answer": "the mailman sentenced the surgeon",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "judge",
              "is_middle_entity": false
            }
          ],
          "photographer": [
            {
              "question": "What did the photographer do?",
              "answer": "expel the judge",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "Who handcuffed the photographer?",
              "answer": "the principal",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was handcuffed do?",
              "answer": "expelled the judge",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the photographer's action?",
              "answer": "the principal handcuffing the photographer",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the photographer's involvement?",
              "answer": "the judge shot the mailman",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "photographer",
              "is_middle_entity": false
            }
          ],
          "surgeon": [
            {
              "question": "What did the surgeon do?",
              "answer": "deliver mail to the police officer",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "Who sentenced the surgeon?",
              "answer": "the mailman",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was sentenced do?",
              "answer": "delivered mail to the police officer",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the surgeon's action?",
              "answer": "the principal handcuffing the photographer which led to the photographer expelling the judge which led to the judge shooting the mailman which led to the mailman sentencing the surgeon",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the surgeon's involvement?",
              "answer": "the police officer sutured",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "surgeon",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 36
      },
      {
        "id": "complexity_5_sentence_17",
        "sentence": "The boat that the bicycle that the ambulance that the spaceship that the motorcycle that the train moored to whistled at wheelied at orbited blared the siren at pedaled.",
        "structure": [
          {
            "subject": "boat",
            "action": "pedaled",
            "object": null
          },
          {
            "subject": "bicycle",
            "action": "blared the siren at",
            "object": "boat"
          },
          {
            "subject": "ambulance",
            "action": "orbited",
            "object": "bicycle"
          },
          {
            "subject": "spaceship",
            "action": "wheelied at",
            "object": "ambulance"
          },
          {
            "subject": "motorcycle",
            "action": "whistled at",
            "object": "spaceship"
          },
          {
            "subject": "train",
            "action": "moored to",
            "object": "motorcycle"
          }
        ],
        "middle_entity": "ambulance",
        "all_entities": [
          "ambulance",
          "train",
          "boat",
          "bicycle",
          "motorcycle",
          "spaceship"
        ],
        "questions_by_entity": {
          "ambulance": [
            {
              "question": "What did the ambulance do?",
              "answer": "orbit the bicycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": true
            },
            {
              "question": "What wheelied at the ambulance?",
              "answer": "the spaceship",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was wheelied at do?",
              "answer": "orbited the bicycle",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the ambulance's action?",
              "answer": "the train mooring to the motorcycle which led to the motorcycle whistling at the spaceship which led to the spaceship doing a wheelie at the ambulance",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the ambulance's involvement?",
              "answer": "the bicycle blared the siren at the boat",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": true
            }
          ],
          "train": [
            {
              "question": "What did the train do?",
              "answer": "moor to the motorcycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the train?",
              "answer": "the motorcycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the train do?",
              "answer": "whistled at the spaceship",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the train's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the train's involvement?",
              "answer": "the motorcycle whistled at the spaceship",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            }
          ],
          "boat": [
            {
              "question": "What did the boat do?",
              "answer": "pedal",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What blared the siren at the boat?",
              "answer": "the bicycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was blared the siren at do?",
              "answer": "pedaled",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the boat's action?",
              "answer": "the train mooring to the motorcycle which led to the motorcycle whistling at the spaceship which led to the spaceship doing a wheelie at the ambulance which led to the ambulance orbiting the bicycle which led to the bicycle blaring the siren at the boat",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the boat's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            }
          ],
          "bicycle": [
            {
              "question": "What did the bicycle do?",
              "answer": "blared the siren at the boat",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What orbited the bicycle?",
              "answer": "the ambulance",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was orbited do?",
              "answer": "blared the siren at the boat",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the bicycle's action?",
              "answer": "the train mooring to the motorcycle which led to the motorcycle whistling at the spaceship which led to the spaceship doing a wheelie at the ambulance which led to the ambulance orbiting the bicycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the bicycle's involvement?",
              "answer": "the boat pedaled",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": false
            }
          ],
          "motorcycle": [
            {
              "question": "What did the motorcycle do?",
              "answer": "whistle at the spaceship",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What moored to the motorcycle?",
              "answer": "the train",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was moored do?",
              "answer": "whistled at the spaceship",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the motorcycle's action?",
              "answer": "the train mooring to the motorcycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the motorcycle's involvement?",
              "answer": "the spaceship wheelied at the ambulance",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": false
            }
          ],
          "spaceship": [
            {
              "question": "What did the spaceship do?",
              "answer": "wheelie at the ambulance",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What whistled at the spaceship?",
              "answer": "the motorcycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was whistled at do?",
              "answer": "wheelied at the ambulance",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the spaceship's action?",
              "answer": "the train mooring to the motorcycle which led to the motorcycle whistling at the spaceship",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the spaceship's involvement?",
              "answer": "the ambulance orbited the bicycle",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 36
      },
      {
        "id": "complexity_5_sentence_18",
        "sentence": "The deer that the horse that the spider that the dolphin that the lizard that the pig bounded toward oinked at basked toward squeaked at crawled toward neighed.",
        "structure": [
          {
            "subject": "deer",
            "action": "neighed",
            "object": null
          },
          {
            "subject": "horse",
            "action": "crawled toward",
            "object": "deer"
          },
          {
            "subject": "spider",
            "action": "squeaked at",
            "object": "horse"
          },
          {
            "subject": "dolphin",
            "action": "basked toward",
            "object": "spider"
          },
          {
            "subject": "lizard",
            "action": "oinked at",
            "object": "dolphin"
          },
          {
            "subject": "pig",
            "action": "bounded toward",
            "object": "lizard"
          }
        ],
        "middle_entity": "spider",
        "all_entities": [
          "lizard",
          "pig",
          "deer",
          "dolphin",
          "spider",
          "horse"
        ],
        "questions_by_entity": {
          "lizard": [
            {
              "question": "What did the lizard do?",
              "answer": "oink at the dolphin",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "lizard",
              "is_middle_entity": false
            },
            {
              "question": "What bounded toward the lizard?",
              "answer": "the pig",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "lizard",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "lizard",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was bounded toward do?",
              "answer": "oinked at the dolphin",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "lizard",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the lizard's action?",
              "answer": "the pig bounding toward the lizard",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "lizard",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the lizard's involvement?",
              "answer": "the dolphin basked toward the spider",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "lizard",
              "is_middle_entity": false
            }
          ],
          "pig": [
            {
              "question": "What did the pig do?",
              "answer": "bound toward the lizard",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "pig",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the pig?",
              "answer": "the lizard",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "pig",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "pig",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the pig do?",
              "answer": "oinked at the dolphin",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "pig",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the pig's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "pig",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the pig's involvement?",
              "answer": "the lizard oinked at the dolphin",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "pig",
              "is_middle_entity": false
            }
          ],
          "deer": [
            {
              "question": "What did the deer do?",
              "answer": "neigh",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "deer",
              "is_middle_entity": false
            },
            {
              "question": "What crawled toward the deer?",
              "answer": "the horse",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "deer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "deer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was crawled toward do?",
              "answer": "neighed",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "deer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the deer's action?",
              "answer": "the pig bounding toward the lizard which led to the lizard oinking at the dolphin which led to the dolphin basking toward the spider which led to the spider squeaking at the horse which led to the horse crawling toward the deer",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "deer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the deer's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "deer",
              "is_middle_entity": false
            }
          ],
          "dolphin": [
            {
              "question": "What did the dolphin do?",
              "answer": "bask toward the spider",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "dolphin",
              "is_middle_entity": false
            },
            {
              "question": "What oinked at the dolphin?",
              "answer": "the lizard",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "dolphin",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "dolphin",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was oinked at do?",
              "answer": "basked toward the spider",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "dolphin",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the dolphin's action?",
              "answer": "the pig bounding toward the lizard which led to the lizard oinking at the dolphin",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "dolphin",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the dolphin's involvement?",
              "answer": "the spider squeaked at the horse",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "dolphin",
              "is_middle_entity": false
            }
          ],
          "spider": [
            {
              "question": "What did the spider do?",
              "answer": "squeak at the horse",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "spider",
              "is_middle_entity": true
            },
            {
              "question": "What basked toward the spider?",
              "answer": "the dolphin",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "spider",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "spider",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was basked toward do?",
              "answer": "squeaked at the horse",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "spider",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the spider's action?",
              "answer": "the pig bounding toward the lizard which led to the lizard oinking at the dolphin which led to the dolphin basking toward the spider",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "spider",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the spider's involvement?",
              "answer": "the horse crawled toward the deer",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "spider",
              "is_middle_entity": true
            }
          ],
          "horse": [
            {
              "question": "What did the horse do?",
              "answer": "crawl toward the deer",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "horse",
              "is_middle_entity": false
            },
            {
              "question": "What squeaked at the horse?",
              "answer": "the spider",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "horse",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "horse",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was squeaked at do?",
              "answer": "crawled toward the deer",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "horse",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the horse's action?",
              "answer": "the pig bounding toward the lizard which led to the lizard oinking at the dolphin which led to the dolphin basking toward the spider which led to the spider squeaking at the horse",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "horse",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the horse's involvement?",
              "answer": "the deer neighed",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "horse",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 36
      },
      {
        "id": "complexity_5_sentence_19",
        "sentence": "The police officer that the nurse that the mailman that the surgeon that the firefighter that the teacher handcuffed lectured to rescued sutured delivered mail to triaged.",
        "structure": [
          {
            "subject": "police officer",
            "action": "triaged",
            "object": null
          },
          {
            "subject": "nurse",
            "action": "delivered mail to",
            "object": "police officer"
          },
          {
            "subject": "mailman",
            "action": "sutured",
            "object": "nurse"
          },
          {
            "subject": "surgeon",
            "action": "rescued",
            "object": "mailman"
          },
          {
            "subject": "firefighter",
            "action": "lectured to",
            "object": "surgeon"
          },
          {
            "subject": "teacher",
            "action": "handcuffed",
            "object": "firefighter"
          }
        ],
        "middle_entity": "mailman",
        "all_entities": [
          "mailman",
          "teacher",
          "police officer",
          "surgeon",
          "nurse",
          "firefighter"
        ],
        "questions_by_entity": {
          "mailman": [
            {
              "question": "What did the mailman do?",
              "answer": "suture the nurse",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "mailman",
              "is_middle_entity": true
            },
            {
              "question": "Who rescued the mailman?",
              "answer": "the surgeon",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "mailman",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "mailman",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was rescued do?",
              "answer": "sutured the nurse",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "mailman",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the mailman's action?",
              "answer": "the teacher handcuffing the firefighter which led to the firefighter lecturing to the surgeon which led to the surgeon rescuing the mailman",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "mailman",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the mailman's involvement?",
              "answer": "the nurse delivered mail to the police officer",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "mailman",
              "is_middle_entity": true
            }
          ],
          "teacher": [
            {
              "question": "What did the teacher do?",
              "answer": "handcuff the firefighter",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "Who was affected by the teacher?",
              "answer": "the firefighter",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the teacher do?",
              "answer": "lectured to the surgeon",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the teacher's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the teacher's involvement?",
              "answer": "the firefighter lectured to the surgeon",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "teacher",
              "is_middle_entity": false
            }
          ],
          "police officer": [
            {
              "question": "What did the police officer do?",
              "answer": "triage",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "Who delivered mail to the police officer?",
              "answer": "the nurse",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was delivered mail do?",
              "answer": "triaged",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the police officer's action?",
              "answer": "the teacher handcuffing the firefighter which led to the firefighter lecturing to the surgeon which led to the surgeon rescuing the mailman which led to the mailman suturing the nurse which led to the nurse delivering mail to the police officer",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the police officer's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "police officer",
              "is_middle_entity": false
            }
          ],
          "surgeon": [
            {
              "question": "What did the surgeon do?",
              "answer": "rescue the mailman",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "Who lectured to the surgeon?",
              "answer": "the firefighter",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was lectured do?",
              "answer": "rescued the mailman",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the surgeon's action?",
              "answer": "the teacher handcuffing the firefighter which led to the firefighter lecturing to the surgeon",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the surgeon's involvement?",
              "answer": "the mailman sutured the nurse",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "surgeon",
              "is_middle_entity": false
            }
          ],
          "nurse": [
            {
              "question": "What did the nurse do?",
              "answer": "deliver mail to the police officer",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "Who sutured the nurse?",
              "answer": "the mailman",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was sutured do?",
              "answer": "delivered mail to the police officer",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the nurse's action?",
              "answer": "the teacher handcuffing the firefighter which led to the firefighter lecturing to the surgeon which led to the surgeon rescuing the mailman which led to the mailman suturing the nurse",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the nurse's involvement?",
              "answer": "the police officer triaged",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "nurse",
              "is_middle_entity": false
            }
          ],
          "firefighter": [
            {
              "question": "What did the firefighter do?",
              "answer": "lecture to the surgeon",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "Who handcuffed the firefighter?",
              "answer": "the teacher",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was handcuffed do?",
              "answer": "lectured to the surgeon",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the firefighter's action?",
              "answer": "the teacher handcuffing the firefighter",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the firefighter's involvement?",
              "answer": "the surgeon rescued the mailman",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "firefighter",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 36
      },
      {
        "id": "complexity_5_sentence_20",
        "sentence": "The sheep that the seagull that the giraffe that the donkey that the coyote that the frog bleated at hopped toward yipped at brayed at stretched toward wheeled above the harbor.",
        "structure": [
          {
            "subject": "sheep",
            "action": "wheeled above the harbor",
            "object": null
          },
          {
            "subject": "seagull",
            "action": "stretched toward",
            "object": "sheep"
          },
          {
            "subject": "giraffe",
            "action": "brayed at",
            "object": "seagull"
          },
          {
            "subject": "donkey",
            "action": "yipped at",
            "object": "giraffe"
          },
          {
            "subject": "coyote",
            "action": "hopped toward",
            "object": "donkey"
          },
          {
            "subject": "frog",
            "action": "bleated at",
            "object": "coyote"
          }
        ],
        "middle_entity": "giraffe",
        "all_entities": [
          "sheep",
          "coyote",
          "seagull",
          "donkey",
          "frog",
          "giraffe"
        ],
        "questions_by_entity": {
          "sheep": [
            {
              "question": "What did the sheep do?",
              "answer": "wheel above the harbor",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "sheep",
              "is_middle_entity": false
            },
            {
              "question": "What stretched toward the sheep?",
              "answer": "the seagull",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "sheep",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "sheep",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was stretched toward do?",
              "answer": "wheeled above the harbor",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "sheep",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the sheep's action?",
              "answer": "the frog bleating at the coyote which led to the coyote hopping toward the donkey which led to the donkey yipping at the giraffe which led to the giraffe braying at the seagull which led to the seagull stretching toward the sheep",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "sheep",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the sheep's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "sheep",
              "is_middle_entity": false
            }
          ],
          "coyote": [
            {
              "question": "What did the coyote do?",
              "answer": "hop toward the donkey",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "coyote",
              "is_middle_entity": false
            },
            {
              "question": "What bleated at the coyote?",
              "answer": "the frog",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "coyote",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "coyote",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was bleated at do?",
              "answer": "hopped toward the donkey",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "coyote",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the coyote's action?",
              "answer": "the frog bleating at the coyote",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "coyote",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the coyote's involvement?",
              "answer": "the donkey yipped at the giraffe",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "coyote",
              "is_middle_entity": false
            }
          ],
          "seagull": [
            {
              "question": "What did the seagull do?",
              "answer": "stretch toward the sheep",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "seagull",
              "is_middle_entity": false
            },
            {
              "question": "What brayed at the seagull?",
              "answer": "the giraffe",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "seagull",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "seagull",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was brayed at do?",
              "answer": "stretched toward the sheep",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "seagull",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the seagull's action?",
              "answer": "the frog bleating at the coyote which led to the coyote hopping toward the donkey which led to the donkey yipping at the giraffe which led to the giraffe braying at the seagull",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "seagull",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the seagull's involvement?",
              "answer": "the sheep wheeled above the harbor",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "seagull",
              "is_middle_entity": false
            }
          ],
          "donkey": [
            {
              "question": "What did the donkey do?",
              "answer": "yip at the giraffe",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "donkey",
              "is_middle_entity": false
            },
            {
              "question": "What hopped toward the donkey?",
              "answer": "the coyote",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "donkey",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "donkey",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was hopped toward do?",
              "answer": "yipped at the giraffe",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "donkey",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the donkey's action?",
              "answer": "the frog bleating at the coyote which led to the coyote hopping toward the donkey",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "donkey",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the donkey's involvement?",
              "answer": "the giraffe brayed at the seagull",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "donkey",
              "is_middle_entity": false
            }
          ],
          "frog": [
            {
              "question": "What did the frog do?",
              "answer": "bleat at the coyote",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "frog",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the frog?",
              "answer": "the coyote",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "frog",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "frog",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the frog do?",
              "answer": "hopped toward the donkey",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "frog",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the frog's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "frog",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the frog's involvement?",
              "answer": "the coyote hopped toward the donkey",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "frog",
              "is_middle_entity": false
            }
          ],
          "giraffe": [
            {
              "question": "What did the giraffe do?",
              "answer": "bray at the seagull",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "giraffe",
              "is_middle_entity": true
            },
            {
              "question": "What yipped at the giraffe?",
              "answer": "the donkey",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "giraffe",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "giraffe",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was yipped at do?",
              "answer": "brayed at the seagull",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "giraffe",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the giraffe's action?",
              "answer": "the frog bleating at the coyote which led to the coyote hopping toward the donkey which led to the donkey yipping at the giraffe",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "giraffe",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the giraffe's involvement?",
              "answer": "the seagull stretched toward the sheep",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "giraffe",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 36
      },
      {
        "id": "complexity_5_sentence_21",
        "sentence": "The teacher that the photographer that the nurse that the principal that the police officer that the judge assigned homework to gaveled arrested expelled bandaged photographed.",
        "structure": [
          {
            "subject": "teacher",
            "action": "photographed",
            "object": null
          },
          {
            "subject": "photographer",
            "action": "bandaged",
            "object": "teacher"
          },
          {
            "subject": "nurse",
            "action": "expelled",
            "object": "photographer"
          },
          {
            "subject": "principal",
            "action": "arrested",
            "object": "nurse"
          },
          {
            "subject": "police officer",
            "action": "gaveled",
            "object": "principal"
          },
          {
            "subject": "judge",
            "action": "assigned homework to",
            "object": "police officer"
          }
        ],
        "middle_entity": "nurse",
        "all_entities": [
          "principal",
          "teacher",
          "police officer",
          "judge",
          "photographer",
          "nurse"
        ],
        "questions_by_entity": {
          "principal": [
            {
              "question": "What did the principal do?",
              "answer": "arrest the nurse",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "Who gaveled the principal?",
              "answer": "the police officer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was gaveled do?",
              "answer": "arrested the nurse",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the principal's action?",
              "answer": "the judge assigning homework to the police officer which led to the police officer gaveling the principal",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the principal's involvement?",
              "answer": "the nurse expelled the photographer",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "principal",
              "is_middle_entity": false
            }
          ],
          "teacher": [
            {
              "question": "What did the teacher do?",
              "answer": "photograph",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "Who bandaged the teacher?",
              "answer": "the photographer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was bandaged do?",
              "answer": "photographed",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the teacher's action?",
              "answer": "the judge assigning homework to the police officer which led to the police officer gaveling the principal which led to the principal arresting the nurse which led to the nurse expelling the photographer which led to the photographer bandaging the teacher",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the teacher's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "teacher",
              "is_middle_entity": false
            }
          ],
          "police officer": [
            {
              "question": "What did the police officer do?",
              "answer": "gavel the principal",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "Who assigned homework to the police officer?",
              "answer": "the judge",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was assigned homework do?",
              "answer": "gaveled the principal",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the police officer's action?",
              "answer": "the judge assigning homework to the police officer",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the police officer's involvement?",
              "answer": "the principal arrested the nurse",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "police officer",
              "is_middle_entity": false
            }
          ],
          "judge": [
            {
              "question": "What did the judge do?",
              "answer": "assign homework to the police officer",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "Who was affected by the judge?",
              "answer": "the police officer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the judge do?",
              "answer": "gaveled the principal",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the judge's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the judge's involvement?",
              "answer": "the police officer gaveled the principal",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "judge",
              "is_middle_entity": false
            }
          ],
          "photographer": [
            {
              "question": "What did the photographer do?",
              "answer": "bandage the teacher",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "Who expelled the photographer?",
              "answer": "the nurse",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was expelled do?",
              "answer": "bandaged the teacher",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the photographer's action?",
              "answer": "the judge assigning homework to the police officer which led to the police officer gaveling the principal which led to the principal arresting the nurse which led to the nurse expelling the photographer",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the photographer's involvement?",
              "answer": "the teacher photographed",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "photographer",
              "is_middle_entity": false
            }
          ],
          "nurse": [
            {
              "question": "What did the nurse do?",
              "answer": "expel the photographer",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "nurse",
              "is_middle_entity": true
            },
            {
              "question": "Who arrested the nurse?",
              "answer": "the principal",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "nurse",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "nurse",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was arrested do?",
              "answer": "expelled the photographer",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "nurse",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the nurse's action?",
              "answer": "the judge assigning homework to the police officer which led to the police officer gaveling the principal which led to the principal arresting the nurse",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "nurse",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the nurse's involvement?",
              "answer": "the photographer bandaged the teacher",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "nurse",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 36
      },
      {
        "id": "complexity_5_sentence_22",
        "sentence": "The tuna that the crab that the deer that the rabbit that the starfish that the mouse schooled with squeaked at crawled toward thumped at leaped at scuttled.",
        "structure": [
          {
            "subject": "tuna",
            "action": "scuttled",
            "object": null
          },
          {
            "subject": "crab",
            "action": "leaped at",
            "object": "tuna"
          },
          {
            "subject": "deer",
            "action": "thumped at",
            "object": "crab"
          },
          {
            "subject": "rabbit",
            "action": "crawled toward",
            "object": "deer"
          },
          {
            "subject": "starfish",
            "action": "squeaked at",
            "object": "rabbit"
          },
          {
            "subject": "mouse",
            "action": "schooled with",
            "object": "starfish"
          }
        ],
        "middle_entity": "deer",
        "all_entities": [
          "starfish",
          "deer",
          "crab",
          "tuna",
          "mouse",
          "rabbit"
        ],
        "questions_by_entity": {
          "starfish": [
            {
              "question": "What did the starfish do?",
              "answer": "squeak at the rabbit",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "starfish",
              "is_middle_entity": false
            },
            {
              "question": "What schooled with the starfish?",
              "answer": "the mouse",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "starfish",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "starfish",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was schooled with do?",
              "answer": "squeaked at the rabbit",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "starfish",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the starfish's action?",
              "answer": "the mouse schooling with the starfish",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "starfish",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the starfish's involvement?",
              "answer": "the rabbit crawled toward the deer",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "starfish",
              "is_middle_entity": false
            }
          ],
          "deer": [
            {
              "question": "What did the deer do?",
              "answer": "thump at the crab",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "deer",
              "is_middle_entity": true
            },
            {
              "question": "What crawled toward the deer?",
              "answer": "the rabbit",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "deer",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "deer",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was crawled toward do?",
              "answer": "thumped at the crab",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "deer",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the deer's action?",
              "answer": "the mouse schooling with the starfish which led to the starfish squeaking at the rabbit which led to the rabbit crawling toward the deer",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "deer",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the deer's involvement?",
              "answer": "the crab leaped at the tuna",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "deer",
              "is_middle_entity": true
            }
          ],
          "crab": [
            {
              "question": "What did the crab do?",
              "answer": "leap at the tuna",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "crab",
              "is_middle_entity": false
            },
            {
              "question": "What thumped at the crab?",
              "answer": "the deer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "crab",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "crab",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was thumped at do?",
              "answer": "leaped at the tuna",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "crab",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the crab's action?",
              "answer": "the mouse schooling with the starfish which led to the starfish squeaking at the rabbit which led to the rabbit crawling toward the deer which led to the deer thumping at the crab",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "crab",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the crab's involvement?",
              "answer": "the tuna scuttled",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "crab",
              "is_middle_entity": false
            }
          ],
          "tuna": [
            {
              "question": "What did the tuna do?",
              "answer": "scuttle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "tuna",
              "is_middle_entity": false
            },
            {
              "question": "What leaped at the tuna?",
              "answer": "the crab",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "tuna",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "tuna",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was leaped at do?",
              "answer": "scuttled",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "tuna",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the tuna's action?",
              "answer": "the mouse schooling with the starfish which led to the starfish squeaking at the rabbit which led to the rabbit crawling toward the deer which led to the deer thumping at the crab which led to the crab leaping at the tuna",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "tuna",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the tuna's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "tuna",
              "is_middle_entity": false
            }
          ],
          "mouse": [
            {
              "question": "What did the mouse do?",
              "answer": "school with the starfish",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "mouse",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the mouse?",
              "answer": "the starfish",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "mouse",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "mouse",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the mouse do?",
              "answer": "squeaked at the rabbit",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "mouse",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the mouse's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "mouse",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the mouse's involvement?",
              "answer": "the starfish squeaked at the rabbit",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "mouse",
              "is_middle_entity": false
            }
          ],
          "rabbit": [
            {
              "question": "What did the rabbit do?",
              "answer": "crawl toward the deer",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "rabbit",
              "is_middle_entity": false
            },
            {
              "question": "What squeaked at the rabbit?",
              "answer": "the starfish",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "rabbit",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "rabbit",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was squeaked at do?",
              "answer": "crawled toward the deer",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "rabbit",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the rabbit's action?",
              "answer": "the mouse schooling with the starfish which led to the starfish squeaking at the rabbit",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "rabbit",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the rabbit's involvement?",
              "answer": "the deer thumped at the crab",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "rabbit",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 36
      },
      {
        "id": "complexity_5_sentence_23",
        "sentence": "The truck that the airplane that the ambulance that the bicycle that the train that the spaceship jackknifed into orbited whistled at rang the bell at blared the siren at taxied.",
        "structure": [
          {
            "subject": "truck",
            "action": "taxied",
            "object": null
          },
          {
            "subject": "airplane",
            "action": "blared the siren at",
            "object": "truck"
          },
          {
            "subject": "ambulance",
            "action": "rang the bell at",
            "object": "airplane"
          },
          {
            "subject": "bicycle",
            "action": "whistled at",
            "object": "ambulance"
          },
          {
            "subject": "train",
            "action": "orbited",
            "object": "bicycle"
          },
          {
            "subject": "spaceship",
            "action": "jackknifed into",
            "object": "train"
          }
        ],
        "middle_entity": "ambulance",
        "all_entities": [
          "airplane",
          "ambulance",
          "train",
          "bicycle",
          "spaceship",
          "truck"
        ],
        "questions_by_entity": {
          "airplane": [
            {
              "question": "What did the airplane do?",
              "answer": "blared the siren at the truck",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What rang the bell at the airplane?",
              "answer": "the ambulance",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was ringed do?",
              "answer": "blared the siren at the truck",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the airplane's action?",
              "answer": "the spaceship jackknifing into the train which led to the train orbiting the bicycle which led to the bicycle whistling at the ambulance which led to the ambulance ringing the bell at the airplane",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the airplane's involvement?",
              "answer": "the truck taxied",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            }
          ],
          "ambulance": [
            {
              "question": "What did the ambulance do?",
              "answer": "ring the bell at the airplane",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": true
            },
            {
              "question": "What whistled at the ambulance?",
              "answer": "the bicycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was whistled at do?",
              "answer": "rang the bell at the airplane",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the ambulance's action?",
              "answer": "the spaceship jackknifing into the train which led to the train orbiting the bicycle which led to the bicycle whistling at the ambulance",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the ambulance's involvement?",
              "answer": "the airplane blared the siren at the truck",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": true
            }
          ],
          "train": [
            {
              "question": "What did the train do?",
              "answer": "orbit the bicycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What jackknifed into the train?",
              "answer": "the spaceship",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was jackknifed into do?",
              "answer": "orbited the bicycle",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the train's action?",
              "answer": "the spaceship jackknifing into the train",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the train's involvement?",
              "answer": "the bicycle whistled at the ambulance",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            }
          ],
          "bicycle": [
            {
              "question": "What did the bicycle do?",
              "answer": "whistle at the ambulance",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What orbited the bicycle?",
              "answer": "the train",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was orbited do?",
              "answer": "whistled at the ambulance",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the bicycle's action?",
              "answer": "the spaceship jackknifing into the train which led to the train orbiting the bicycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the bicycle's involvement?",
              "answer": "the ambulance rang the bell at the airplane",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": false
            }
          ],
          "spaceship": [
            {
              "question": "What did the spaceship do?",
              "answer": "jackknife into the train",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the spaceship?",
              "answer": "the train",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the spaceship do?",
              "answer": "orbited the bicycle",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the spaceship's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the spaceship's involvement?",
              "answer": "the train orbited the bicycle",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            }
          ],
          "truck": [
            {
              "question": "What did the truck do?",
              "answer": "taxi",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What blared the siren at the truck?",
              "answer": "the airplane",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was blared the siren at do?",
              "answer": "taxied",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the truck's action?",
              "answer": "the spaceship jackknifing into the train which led to the train orbiting the bicycle which led to the bicycle whistling at the ambulance which led to the ambulance ringing the bell at the airplane which led to the airplane blaring the siren at the truck",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the truck's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 36
      },
      {
        "id": "complexity_5_sentence_24",
        "sentence": "The spaceship that the airplane that the truck that the boat that the train that the ambulance orbited blared the siren at whistled at moored to jackknifed into taxied.",
        "structure": [
          {
            "subject": "spaceship",
            "action": "taxied",
            "object": null
          },
          {
            "subject": "airplane",
            "action": "jackknifed into",
            "object": "spaceship"
          },
          {
            "subject": "truck",
            "action": "moored to",
            "object": "airplane"
          },
          {
            "subject": "boat",
            "action": "whistled at",
            "object": "truck"
          },
          {
            "subject": "train",
            "action": "blared the siren at",
            "object": "boat"
          },
          {
            "subject": "ambulance",
            "action": "orbited",
            "object": "train"
          }
        ],
        "middle_entity": "truck",
        "all_entities": [
          "airplane",
          "ambulance",
          "train",
          "boat",
          "spaceship",
          "truck"
        ],
        "questions_by_entity": {
          "airplane": [
            {
              "question": "What did the airplane do?",
              "answer": "jackknife into the spaceship",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What moored to the airplane?",
              "answer": "the truck",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was moored do?",
              "answer": "jackknifed into the spaceship",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the airplane's action?",
              "answer": "the ambulance orbiting the train which led to the train blaring the siren at the boat which led to the boat whistling at the truck which led to the truck mooring to the airplane",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the airplane's involvement?",
              "answer": "the spaceship taxied",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            }
          ],
          "ambulance": [
            {
              "question": "What did the ambulance do?",
              "answer": "orbit the train",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the ambulance?",
              "answer": "the train",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the ambulance do?",
              "answer": "blared the siren at the boat",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the ambulance's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the ambulance's involvement?",
              "answer": "the train blared the siren at the boat",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": false
            }
          ],
          "train": [
            {
              "question": "What did the train do?",
              "answer": "blared the siren at the boat",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What orbited the train?",
              "answer": "the ambulance",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was orbited do?",
              "answer": "blared the siren at the boat",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the train's action?",
              "answer": "the ambulance orbiting the train",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the train's involvement?",
              "answer": "the boat whistled at the truck",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            }
          ],
          "boat": [
            {
              "question": "What did the boat do?",
              "answer": "whistle at the truck",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What blared the siren at the boat?",
              "answer": "the train",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was blared the siren at do?",
              "answer": "whistled at the truck",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the boat's action?",
              "answer": "the ambulance orbiting the train which led to the train blaring the siren at the boat",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the boat's involvement?",
              "answer": "the truck moored to the airplane",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            }
          ],
          "spaceship": [
            {
              "question": "What did the spaceship do?",
              "answer": "taxi",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What jackknifed into the spaceship?",
              "answer": "the airplane",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was jackknifed into do?",
              "answer": "taxied",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the spaceship's action?",
              "answer": "the ambulance orbiting the train which led to the train blaring the siren at the boat which led to the boat whistling at the truck which led to the truck mooring to the airplane which led to the airplane jackknifing into the spaceship",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the spaceship's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            }
          ],
          "truck": [
            {
              "question": "What did the truck do?",
              "answer": "moor to the airplane",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": true
            },
            {
              "question": "What whistled at the truck?",
              "answer": "the boat",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was whistled at do?",
              "answer": "moored to the airplane",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the truck's action?",
              "answer": "the ambulance orbiting the train which led to the train blaring the siren at the boat which led to the boat whistling at the truck",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the truck's involvement?",
              "answer": "the airplane jackknifed into the spaceship",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 36
      },
      {
        "id": "complexity_5_sentence_25",
        "sentence": "The airplane that the train that the truck that the boat that the bicycle that the motorcycle air-dropped on wheelied at cycled around anchored near jackknifed into whistled.",
        "structure": [
          {
            "subject": "airplane",
            "action": "whistled",
            "object": null
          },
          {
            "subject": "train",
            "action": "jackknifed into",
            "object": "airplane"
          },
          {
            "subject": "truck",
            "action": "anchored near",
            "object": "train"
          },
          {
            "subject": "boat",
            "action": "cycled around",
            "object": "truck"
          },
          {
            "subject": "bicycle",
            "action": "wheelied at",
            "object": "boat"
          },
          {
            "subject": "motorcycle",
            "action": "air-dropped on",
            "object": "bicycle"
          }
        ],
        "middle_entity": "truck",
        "all_entities": [
          "airplane",
          "train",
          "boat",
          "bicycle",
          "motorcycle",
          "truck"
        ],
        "questions_by_entity": {
          "airplane": [
            {
              "question": "What did the airplane do?",
              "answer": "whistle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What jackknifed into the airplane?",
              "answer": "the train",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was jackknifed into do?",
              "answer": "whistled",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the airplane's action?",
              "answer": "the motorcycle air-dropping on the bicycle which led to the bicycle doing a wheelie at the boat which led to the boat cycling around the truck which led to the truck anchoring near the train which led to the train jackknifing into the airplane",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the airplane's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            }
          ],
          "train": [
            {
              "question": "What did the train do?",
              "answer": "jackknife into the airplane",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What anchored near the train?",
              "answer": "the truck",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was anchored near do?",
              "answer": "jackknifed into the airplane",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the train's action?",
              "answer": "the motorcycle air-dropping on the bicycle which led to the bicycle doing a wheelie at the boat which led to the boat cycling around the truck which led to the truck anchoring near the train",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the train's involvement?",
              "answer": "the airplane whistled",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            }
          ],
          "boat": [
            {
              "question": "What did the boat do?",
              "answer": "cycle around the truck",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What wheelied at the boat?",
              "answer": "the bicycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was wheelied at do?",
              "answer": "cycled around the truck",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the boat's action?",
              "answer": "the motorcycle air-dropping on the bicycle which led to the bicycle doing a wheelie at the boat",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the boat's involvement?",
              "answer": "the truck anchored near the train",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            }
          ],
          "bicycle": [
            {
              "question": "What did the bicycle do?",
              "answer": "wheelie at the boat",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What air-dropped on the bicycle?",
              "answer": "the motorcycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was air-dropped on do?",
              "answer": "wheelied at the boat",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the bicycle's action?",
              "answer": "the motorcycle air-dropping on the bicycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the bicycle's involvement?",
              "answer": "the boat cycled around the truck",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": false
            }
          ],
          "motorcycle": [
            {
              "question": "What did the motorcycle do?",
              "answer": "air-drop on the bicycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the motorcycle?",
              "answer": "the bicycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the motorcycle do?",
              "answer": "wheelied at the boat",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the motorcycle's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the motorcycle's involvement?",
              "answer": "the bicycle wheelied at the boat",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": false
            }
          ],
          "truck": [
            {
              "question": "What did the truck do?",
              "answer": "anchor near the train",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": true
            },
            {
              "question": "What cycled around the truck?",
              "answer": "the boat",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was cycled around do?",
              "answer": "anchored near the train",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the truck's action?",
              "answer": "the motorcycle air-dropping on the bicycle which led to the bicycle doing a wheelie at the boat which led to the boat cycling around the truck",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the truck's involvement?",
              "answer": "the train jackknifed into the airplane",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 36
      },
      {
        "id": "complexity_5_sentence_26",
        "sentence": "The motorcycle that the truck that the bicycle that the train that the ambulance that the spaceship lane-split past orbited blared the siren at whistled at rang the bell at jackknifed.",
        "structure": [
          {
            "subject": "motorcycle",
            "action": "jackknifed",
            "object": null
          },
          {
            "subject": "truck",
            "action": "rang the bell at",
            "object": "motorcycle"
          },
          {
            "subject": "bicycle",
            "action": "whistled at",
            "object": "truck"
          },
          {
            "subject": "train",
            "action": "blared the siren at",
            "object": "bicycle"
          },
          {
            "subject": "ambulance",
            "action": "orbited",
            "object": "train"
          },
          {
            "subject": "spaceship",
            "action": "lane-split past",
            "object": "ambulance"
          }
        ],
        "middle_entity": "bicycle",
        "all_entities": [
          "ambulance",
          "train",
          "bicycle",
          "motorcycle",
          "truck",
          "spaceship"
        ],
        "questions_by_entity": {
          "ambulance": [
            {
              "question": "What did the ambulance do?",
              "answer": "orbit the train",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What lane-split past the ambulance?",
              "answer": "the spaceship",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was lane-split past do?",
              "answer": "orbited the train",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the ambulance's action?",
              "answer": "the spaceship lane-splitting past the ambulance",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the ambulance's involvement?",
              "answer": "the train blared the siren at the bicycle",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": false
            }
          ],
          "train": [
            {
              "question": "What did the train do?",
              "answer": "blared the siren at the bicycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What orbited the train?",
              "answer": "the ambulance",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was orbited do?",
              "answer": "blared the siren at the bicycle",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the train's action?",
              "answer": "the spaceship lane-splitting past the ambulance which led to the ambulance orbiting the train",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the train's involvement?",
              "answer": "the bicycle whistled at the truck",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            }
          ],
          "bicycle": [
            {
              "question": "What did the bicycle do?",
              "answer": "whistle at the truck",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": true
            },
            {
              "question": "What blared the siren at the bicycle?",
              "answer": "the train",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was blared the siren at do?",
              "answer": "whistled at the truck",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the bicycle's action?",
              "answer": "the spaceship lane-splitting past the ambulance which led to the ambulance orbiting the train which led to the train blaring the siren at the bicycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the bicycle's involvement?",
              "answer": "the truck rang the bell at the motorcycle",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": true
            }
          ],
          "motorcycle": [
            {
              "question": "What did the motorcycle do?",
              "answer": "jackknife",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What rang the bell at the motorcycle?",
              "answer": "the truck",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was ringed do?",
              "answer": "jackknifed",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the motorcycle's action?",
              "answer": "the spaceship lane-splitting past the ambulance which led to the ambulance orbiting the train which led to the train blaring the siren at the bicycle which led to the bicycle whistling at the truck which led to the truck ringing the bell at the motorcycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the motorcycle's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": false
            }
          ],
          "truck": [
            {
              "question": "What did the truck do?",
              "answer": "ring the bell at the motorcycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What whistled at the truck?",
              "answer": "the bicycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was whistled at do?",
              "answer": "rang the bell at the motorcycle",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the truck's action?",
              "answer": "the spaceship lane-splitting past the ambulance which led to the ambulance orbiting the train which led to the train blaring the siren at the bicycle which led to the bicycle whistling at the truck",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the truck's involvement?",
              "answer": "the motorcycle jackknifed",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            }
          ],
          "spaceship": [
            {
              "question": "What did the spaceship do?",
              "answer": "lane-split past the ambulance",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the spaceship?",
              "answer": "the ambulance",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the spaceship do?",
              "answer": "orbited the train",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the spaceship's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the spaceship's involvement?",
              "answer": "the ambulance orbited the train",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 36
      },
      {
        "id": "complexity_5_sentence_27",
        "sentence": "The giraffe that the parrot that the dolphin that the donkey that the cat that the camel stretched toward spat at meowed at brayed at squeaked at chattered.",
        "structure": [
          {
            "subject": "giraffe",
            "action": "chattered",
            "object": null
          },
          {
            "subject": "parrot",
            "action": "squeaked at",
            "object": "giraffe"
          },
          {
            "subject": "dolphin",
            "action": "brayed at",
            "object": "parrot"
          },
          {
            "subject": "donkey",
            "action": "meowed at",
            "object": "dolphin"
          },
          {
            "subject": "cat",
            "action": "spat at",
            "object": "donkey"
          },
          {
            "subject": "camel",
            "action": "stretched toward",
            "object": "cat"
          }
        ],
        "middle_entity": "dolphin",
        "all_entities": [
          "cat",
          "camel",
          "parrot",
          "donkey",
          "dolphin",
          "giraffe"
        ],
        "questions_by_entity": {
          "cat": [
            {
              "question": "What did the cat do?",
              "answer": "spit at the donkey",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "cat",
              "is_middle_entity": false
            },
            {
              "question": "What stretched toward the cat?",
              "answer": "the camel",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "cat",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "cat",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was stretched toward do?",
              "answer": "spat at the donkey",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "cat",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the cat's action?",
              "answer": "the camel stretching toward the cat",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "cat",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the cat's involvement?",
              "answer": "the donkey meowed at the dolphin",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "cat",
              "is_middle_entity": false
            }
          ],
          "camel": [
            {
              "question": "What did the camel do?",
              "answer": "stretch toward the cat",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "camel",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the camel?",
              "answer": "the cat",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "camel",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "camel",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the camel do?",
              "answer": "spat at the donkey",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "camel",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the camel's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "camel",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the camel's involvement?",
              "answer": "the cat spat at the donkey",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "camel",
              "is_middle_entity": false
            }
          ],
          "parrot": [
            {
              "question": "What did the parrot do?",
              "answer": "squeak at the giraffe",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "parrot",
              "is_middle_entity": false
            },
            {
              "question": "What brayed at the parrot?",
              "answer": "the dolphin",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "parrot",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "parrot",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was brayed at do?",
              "answer": "squeaked at the giraffe",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "parrot",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the parrot's action?",
              "answer": "the camel stretching toward the cat which led to the cat spitting at the donkey which led to the donkey meowing at the dolphin which led to the dolphin braying at the parrot",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "parrot",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the parrot's involvement?",
              "answer": "the giraffe chattered",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "parrot",
              "is_middle_entity": false
            }
          ],
          "donkey": [
            {
              "question": "What did the donkey do?",
              "answer": "meow at the dolphin",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "donkey",
              "is_middle_entity": false
            },
            {
              "question": "What spat at the donkey?",
              "answer": "the cat",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "donkey",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "donkey",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was spat at do?",
              "answer": "meowed at the dolphin",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "donkey",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the donkey's action?",
              "answer": "the camel stretching toward the cat which led to the cat spitting at the donkey",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "donkey",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the donkey's involvement?",
              "answer": "the dolphin brayed at the parrot",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "donkey",
              "is_middle_entity": false
            }
          ],
          "dolphin": [
            {
              "question": "What did the dolphin do?",
              "answer": "bray at the parrot",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "dolphin",
              "is_middle_entity": true
            },
            {
              "question": "What meowed at the dolphin?",
              "answer": "the donkey",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "dolphin",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "dolphin",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was meowed at do?",
              "answer": "brayed at the parrot",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "dolphin",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the dolphin's action?",
              "answer": "the camel stretching toward the cat which led to the cat spitting at the donkey which led to the donkey meowing at the dolphin",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "dolphin",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the dolphin's involvement?",
              "answer": "the parrot squeaked at the giraffe",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "dolphin",
              "is_middle_entity": true
            }
          ],
          "giraffe": [
            {
              "question": "What did the giraffe do?",
              "answer": "chatter",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "giraffe",
              "is_middle_entity": false
            },
            {
              "question": "What squeaked at the giraffe?",
              "answer": "the parrot",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "giraffe",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "giraffe",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was squeaked at do?",
              "answer": "chattered",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "giraffe",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the giraffe's action?",
              "answer": "the camel stretching toward the cat which led to the cat spitting at the donkey which led to the donkey meowing at the dolphin which led to the dolphin braying at the parrot which led to the parrot squeaking at the giraffe",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "giraffe",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the giraffe's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "giraffe",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 36
      },
      {
        "id": "complexity_5_sentence_28",
        "sentence": "The ambulance that the motorcycle that the boat that the spaceship that the truck that the train blared the siren at whistled at towed orbited sailed past wheelied.",
        "structure": [
          {
            "subject": "ambulance",
            "action": "wheelied",
            "object": null
          },
          {
            "subject": "motorcycle",
            "action": "sailed past",
            "object": "ambulance"
          },
          {
            "subject": "boat",
            "action": "orbited",
            "object": "motorcycle"
          },
          {
            "subject": "spaceship",
            "action": "towed",
            "object": "boat"
          },
          {
            "subject": "truck",
            "action": "whistled at",
            "object": "spaceship"
          },
          {
            "subject": "train",
            "action": "blared the siren at",
            "object": "truck"
          }
        ],
        "middle_entity": "boat",
        "all_entities": [
          "ambulance",
          "train",
          "boat",
          "truck",
          "spaceship",
          "motorcycle"
        ],
        "questions_by_entity": {
          "ambulance": [
            {
              "question": "What did the ambulance do?",
              "answer": "wheelie",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What sailed past the ambulance?",
              "answer": "the motorcycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was sailed past do?",
              "answer": "wheelied",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the ambulance's action?",
              "answer": "the train blaring the siren at the truck which led to the truck whistling at the spaceship which led to the spaceship towing the boat which led to the boat orbiting the motorcycle which led to the motorcycle sailing past the ambulance",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the ambulance's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": false
            }
          ],
          "train": [
            {
              "question": "What did the train do?",
              "answer": "blared the siren at the truck",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the train?",
              "answer": "the truck",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the train do?",
              "answer": "whistled at the spaceship",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the train's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the train's involvement?",
              "answer": "the truck whistled at the spaceship",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            }
          ],
          "boat": [
            {
              "question": "What did the boat do?",
              "answer": "orbit the motorcycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": true
            },
            {
              "question": "What towed the boat?",
              "answer": "the spaceship",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was towed do?",
              "answer": "orbited the motorcycle",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the boat's action?",
              "answer": "the train blaring the siren at the truck which led to the truck whistling at the spaceship which led to the spaceship towing the boat",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the boat's involvement?",
              "answer": "the motorcycle sailed past the ambulance",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": true
            }
          ],
          "truck": [
            {
              "question": "What did the truck do?",
              "answer": "whistle at the spaceship",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What blared the siren at the truck?",
              "answer": "the train",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was blared the siren at do?",
              "answer": "whistled at the spaceship",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the truck's action?",
              "answer": "the train blaring the siren at the truck",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the truck's involvement?",
              "answer": "the spaceship towed the boat",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            }
          ],
          "spaceship": [
            {
              "question": "What did the spaceship do?",
              "answer": "tow the boat",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What whistled at the spaceship?",
              "answer": "the truck",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was whistled at do?",
              "answer": "towed the boat",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the spaceship's action?",
              "answer": "the train blaring the siren at the truck which led to the truck whistling at the spaceship",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the spaceship's involvement?",
              "answer": "the boat orbited the motorcycle",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            }
          ],
          "motorcycle": [
            {
              "question": "What did the motorcycle do?",
              "answer": "sail past the ambulance",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What orbited the motorcycle?",
              "answer": "the boat",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was orbited do?",
              "answer": "sailed past the ambulance",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the motorcycle's action?",
              "answer": "the train blaring the siren at the truck which led to the truck whistling at the spaceship which led to the spaceship towing the boat which led to the boat orbiting the motorcycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the motorcycle's involvement?",
              "answer": "the ambulance wheelied",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 36
      },
      {
        "id": "complexity_5_sentence_29",
        "sentence": "The ambulance that the spaceship that the bicycle that the truck that the train that the boat blared the siren at anchored near whistled at jackknifed into rang the bell at blasted off into the sky.",
        "structure": [
          {
            "subject": "ambulance",
            "action": "blasted off into the sky",
            "object": null
          },
          {
            "subject": "spaceship",
            "action": "rang the bell at",
            "object": "ambulance"
          },
          {
            "subject": "bicycle",
            "action": "jackknifed into",
            "object": "spaceship"
          },
          {
            "subject": "truck",
            "action": "whistled at",
            "object": "bicycle"
          },
          {
            "subject": "train",
            "action": "anchored near",
            "object": "truck"
          },
          {
            "subject": "boat",
            "action": "blared the siren at",
            "object": "train"
          }
        ],
        "middle_entity": "bicycle",
        "all_entities": [
          "ambulance",
          "train",
          "boat",
          "bicycle",
          "spaceship",
          "truck"
        ],
        "questions_by_entity": {
          "ambulance": [
            {
              "question": "What did the ambulance do?",
              "answer": "blast off into the sky",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What rang the bell at the ambulance?",
              "answer": "the spaceship",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was ringed do?",
              "answer": "blasted off into the sky",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the ambulance's action?",
              "answer": "the boat blaring the siren at the train which led to the train anchoring near the truck which led to the truck whistling at the bicycle which led to the bicycle jackknifing into the spaceship which led to the spaceship ringing the bell at the ambulance",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the ambulance's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": false
            }
          ],
          "train": [
            {
              "question": "What did the train do?",
              "answer": "anchor near the truck",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What blared the siren at the train?",
              "answer": "the boat",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was blared the siren at do?",
              "answer": "anchored near the truck",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the train's action?",
              "answer": "the boat blaring the siren at the train",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the train's involvement?",
              "answer": "the truck whistled at the bicycle",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            }
          ],
          "boat": [
            {
              "question": "What did the boat do?",
              "answer": "blared siren at the train",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the boat?",
              "answer": "the train",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the boat do?",
              "answer": "anchored near the truck",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the boat's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the boat's involvement?",
              "answer": "the train anchored near the truck",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            }
          ],
          "bicycle": [
            {
              "question": "What did the bicycle do?",
              "answer": "jackknife into the spaceship",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": true
            },
            {
              "question": "What whistled at the bicycle?",
              "answer": "the truck",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was whistled at do?",
              "answer": "jackknifed into the spaceship",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the bicycle's action?",
              "answer": "the boat blaring the siren at the train which led to the train anchoring near the truck which led to the truck whistling at the bicycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the bicycle's involvement?",
              "answer": "the spaceship rang the bell at the ambulance",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": true
            }
          ],
          "spaceship": [
            {
              "question": "What did the spaceship do?",
              "answer": "ring the bell at the ambulance",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What jackknifed into the spaceship?",
              "answer": "the bicycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was jackknifed into do?",
              "answer": "rang the bell at the ambulance",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the spaceship's action?",
              "answer": "the boat blaring the siren at the train which led to the train anchoring near the truck which led to the truck whistling at the bicycle which led to the bicycle jackknifing into the spaceship",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the spaceship's involvement?",
              "answer": "the ambulance blasted off into the sky",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            }
          ],
          "truck": [
            {
              "question": "What did the truck do?",
              "answer": "whistle at the bicycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What anchored near the truck?",
              "answer": "the train",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was anchored near do?",
              "answer": "whistled at the bicycle",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the truck's action?",
              "answer": "the boat blaring the siren at the train which led to the train anchoring near the truck",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the truck's involvement?",
              "answer": "the bicycle jackknifed into the spaceship",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 36
      },
      {
        "id": "complexity_5_sentence_30",
        "sentence": "The spaceship that the boat that the truck that the train that the airplane that the ambulance orbited blared the siren at air-dropped on whistled at towed sailed.",
        "structure": [
          {
            "subject": "spaceship",
            "action": "sailed",
            "object": null
          },
          {
            "subject": "boat",
            "action": "towed",
            "object": "spaceship"
          },
          {
            "subject": "truck",
            "action": "whistled at",
            "object": "boat"
          },
          {
            "subject": "train",
            "action": "air-dropped on",
            "object": "truck"
          },
          {
            "subject": "airplane",
            "action": "blared the siren at",
            "object": "train"
          },
          {
            "subject": "ambulance",
            "action": "orbited",
            "object": "airplane"
          }
        ],
        "middle_entity": "truck",
        "all_entities": [
          "airplane",
          "ambulance",
          "train",
          "boat",
          "spaceship",
          "truck"
        ],
        "questions_by_entity": {
          "airplane": [
            {
              "question": "What did the airplane do?",
              "answer": "blared the siren at the train",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What orbited the airplane?",
              "answer": "the ambulance",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was orbited do?",
              "answer": "blared the siren at the train",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the airplane's action?",
              "answer": "the ambulance orbiting the airplane",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the airplane's involvement?",
              "answer": "the train air-dropped on the truck",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            }
          ],
          "ambulance": [
            {
              "question": "What did the ambulance do?",
              "answer": "orbit the airplane",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the ambulance?",
              "answer": "the airplane",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the ambulance do?",
              "answer": "blared the siren at the train",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the ambulance's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the ambulance's involvement?",
              "answer": "the airplane blared the siren at the train",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": false
            }
          ],
          "train": [
            {
              "question": "What did the train do?",
              "answer": "air-drop on the truck",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What blared the siren at the train?",
              "answer": "the airplane",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was blared the siren at do?",
              "answer": "air-dropped on the truck",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the train's action?",
              "answer": "the ambulance orbiting the airplane which led to the airplane blaring the siren at the train",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the train's involvement?",
              "answer": "the truck whistled at the boat",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            }
          ],
          "boat": [
            {
              "question": "What did the boat do?",
              "answer": "tow the spaceship",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What whistled at the boat?",
              "answer": "the truck",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was whistled at do?",
              "answer": "towed the spaceship",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the boat's action?",
              "answer": "the ambulance orbiting the airplane which led to the airplane blaring the siren at the train which led to the train air-dropping on the truck which led to the truck whistling at the boat",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the boat's involvement?",
              "answer": "the spaceship sailed",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            }
          ],
          "spaceship": [
            {
              "question": "What did the spaceship do?",
              "answer": "sail",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What towed the spaceship?",
              "answer": "the boat",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was towed do?",
              "answer": "sailed",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the spaceship's action?",
              "answer": "the ambulance orbiting the airplane which led to the airplane blaring the siren at the train which led to the train air-dropping on the truck which led to the truck whistling at the boat which led to the boat towing the spaceship",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the spaceship's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            }
          ],
          "truck": [
            {
              "question": "What did the truck do?",
              "answer": "whistle at the boat",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": true
            },
            {
              "question": "What air-dropped on the truck?",
              "answer": "the train",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "6",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was air-dropped on do?",
              "answer": "whistled at the boat",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the truck's action?",
              "answer": "the ambulance orbiting the airplane which led to the airplane blaring the siren at the train which led to the train air-dropping on the truck",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the truck's involvement?",
              "answer": "the boat towed the spaceship",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 36
      }
    ],
    "total_questions": 1080,
    "entities_processed": 180,
    "middle_entities_flagged": 30
  },
  "complexity_6": {
    "sentences": [
      {
        "id": "complexity_6_sentence_1",
        "sentence": "The judge that the doctor that the mailman that the lawyer that the teacher that the police officer that the principal sentenced disciplined handcuffed assigned homework to cross-examined delivered mail to prescribed medicines.",
        "structure": [
          {
            "subject": "judge",
            "action": "prescribed medicines",
            "object": null
          },
          {
            "subject": "doctor",
            "action": "delivered mail to",
            "object": "judge"
          },
          {
            "subject": "mailman",
            "action": "cross-examined",
            "object": "doctor"
          },
          {
            "subject": "lawyer",
            "action": "assigned homework to",
            "object": "mailman"
          },
          {
            "subject": "teacher",
            "action": "handcuffed",
            "object": "lawyer"
          },
          {
            "subject": "police officer",
            "action": "disciplined",
            "object": "teacher"
          },
          {
            "subject": "principal",
            "action": "sentenced",
            "object": "police officer"
          }
        ],
        "middle_entity": "lawyer",
        "all_entities": [
          "principal",
          "mailman",
          "doctor",
          "teacher",
          "lawyer",
          "police officer",
          "judge"
        ],
        "questions_by_entity": {
          "principal": [
            {
              "question": "What did the principal do?",
              "answer": "sentence the police officer",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "Who was affected by the principal?",
              "answer": "the police officer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the principal do?",
              "answer": "disciplined the teacher",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the principal's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the principal's involvement?",
              "answer": "the police officer disciplined the teacher",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "principal",
              "is_middle_entity": false
            }
          ],
          "mailman": [
            {
              "question": "What did the mailman do?",
              "answer": "cross-examine the doctor",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "Who assigned homework to the mailman?",
              "answer": "the lawyer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was assigned homework do?",
              "answer": "cross-examined the doctor",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the mailman's action?",
              "answer": "the principal sentencing the police officer which led to the police officer disciplining the teacher which led to the teacher handcuffing the lawyer which led to the lawyer assigning homework to the mailman",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the mailman's involvement?",
              "answer": "the doctor delivered mail to the judge",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "mailman",
              "is_middle_entity": false
            }
          ],
          "doctor": [
            {
              "question": "What did the doctor do?",
              "answer": "deliver mail to the judge",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "doctor",
              "is_middle_entity": false
            },
            {
              "question": "Who cross-examined the doctor?",
              "answer": "the mailman",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "doctor",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "doctor",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was cross-examined do?",
              "answer": "delivered mail to the judge",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "doctor",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the doctor's action?",
              "answer": "the principal sentencing the police officer which led to the police officer disciplining the teacher which led to the teacher handcuffing the lawyer which led to the lawyer assigning homework to the mailman which led to the mailman cross-examining the doctor",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "doctor",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the doctor's involvement?",
              "answer": "the judge prescribed medicines",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "doctor",
              "is_middle_entity": false
            }
          ],
          "teacher": [
            {
              "question": "What did the teacher do?",
              "answer": "handcuff the lawyer",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "Who disciplined the teacher?",
              "answer": "the police officer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was disciplined do?",
              "answer": "handcuffed the lawyer",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the teacher's action?",
              "answer": "the principal sentencing the police officer which led to the police officer disciplining the teacher",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the teacher's involvement?",
              "answer": "the lawyer assigned homework to the mailman",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "teacher",
              "is_middle_entity": false
            }
          ],
          "lawyer": [
            {
              "question": "What did the lawyer do?",
              "answer": "assign homework to the mailman",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "lawyer",
              "is_middle_entity": true
            },
            {
              "question": "Who handcuffed the lawyer?",
              "answer": "the teacher",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "lawyer",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "lawyer",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was handcuffed do?",
              "answer": "assigned homework to the mailman",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "lawyer",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the lawyer's action?",
              "answer": "the principal sentencing the police officer which led to the police officer disciplining the teacher which led to the teacher handcuffing the lawyer",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "lawyer",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the lawyer's involvement?",
              "answer": "the mailman cross-examined the doctor",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "lawyer",
              "is_middle_entity": true
            }
          ],
          "police officer": [
            {
              "question": "What did the police officer do?",
              "answer": "discipline the teacher",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "Who sentenced the police officer?",
              "answer": "the principal",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was sentenced do?",
              "answer": "disciplined the teacher",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the police officer's action?",
              "answer": "the principal sentencing the police officer",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the police officer's involvement?",
              "answer": "the teacher handcuffed the lawyer",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "police officer",
              "is_middle_entity": false
            }
          ],
          "judge": [
            {
              "question": "What did the judge do?",
              "answer": "prescribe medicines",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "Who delivered mail to the judge?",
              "answer": "the doctor",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was delivered mail do?",
              "answer": "prescribed medicines",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the judge's action?",
              "answer": "the principal sentencing the police officer which led to the police officer disciplining the teacher which led to the teacher handcuffing the lawyer which led to the lawyer assigning homework to the mailman which led to the mailman cross-examining the doctor which led to the doctor delivering mail to the judge",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the judge's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "judge",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 42
      },
      {
        "id": "complexity_6_sentence_2",
        "sentence": "The judge that the lawyer that the surgeon that the mailman that the teacher that the firefighter that the police officer sentenced read rights to rescued assigned homework to delivered mail to incised objected to the statement.",
        "structure": [
          {
            "subject": "judge",
            "action": "objected to the statement",
            "object": null
          },
          {
            "subject": "lawyer",
            "action": "incised",
            "object": "judge"
          },
          {
            "subject": "surgeon",
            "action": "delivered mail to",
            "object": "lawyer"
          },
          {
            "subject": "mailman",
            "action": "assigned homework to",
            "object": "surgeon"
          },
          {
            "subject": "teacher",
            "action": "rescued",
            "object": "mailman"
          },
          {
            "subject": "firefighter",
            "action": "read rights to",
            "object": "teacher"
          },
          {
            "subject": "police officer",
            "action": "sentenced",
            "object": "firefighter"
          }
        ],
        "middle_entity": "mailman",
        "all_entities": [
          "mailman",
          "teacher",
          "lawyer",
          "police officer",
          "judge",
          "surgeon",
          "firefighter"
        ],
        "questions_by_entity": {
          "mailman": [
            {
              "question": "What did the mailman do?",
              "answer": "assign homework to the surgeon",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "mailman",
              "is_middle_entity": true
            },
            {
              "question": "Who rescued the mailman?",
              "answer": "the teacher",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "mailman",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "mailman",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was rescued do?",
              "answer": "assigned homework to the surgeon",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "mailman",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the mailman's action?",
              "answer": "the police officer sentencing the firefighter which led to the firefighter reading rights to the teacher which led to the teacher rescuing the mailman",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "mailman",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the mailman's involvement?",
              "answer": "the surgeon delivered mail to the lawyer",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "mailman",
              "is_middle_entity": true
            }
          ],
          "teacher": [
            {
              "question": "What did the teacher do?",
              "answer": "rescue the mailman",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "Who read rights to the teacher?",
              "answer": "the firefighter",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was read rights do?",
              "answer": "rescued the mailman",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the teacher's action?",
              "answer": "the police officer sentencing the firefighter which led to the firefighter reading rights to the teacher",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the teacher's involvement?",
              "answer": "the mailman assigned homework to the surgeon",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "teacher",
              "is_middle_entity": false
            }
          ],
          "lawyer": [
            {
              "question": "What did the lawyer do?",
              "answer": "incise the judge",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "Who delivered mail to the lawyer?",
              "answer": "the surgeon",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was delivered mail do?",
              "answer": "incised the judge",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the lawyer's action?",
              "answer": "the police officer sentencing the firefighter which led to the firefighter reading rights to the teacher which led to the teacher rescuing the mailman which led to the mailman assigning homework to the surgeon which led to the surgeon delivering mail to the lawyer",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the lawyer's involvement?",
              "answer": "the judge objected to the statement",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "lawyer",
              "is_middle_entity": false
            }
          ],
          "police officer": [
            {
              "question": "What did the police officer do?",
              "answer": "sentence the firefighter",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "Who was affected by the police officer?",
              "answer": "the firefighter",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the police officer do?",
              "answer": "read rights to the teacher",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the police officer's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the police officer's involvement?",
              "answer": "the firefighter read rights to the teacher",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "police officer",
              "is_middle_entity": false
            }
          ],
          "judge": [
            {
              "question": "What did the judge do?",
              "answer": "object to the statement",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "Who incised the judge?",
              "answer": "the lawyer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was incised do?",
              "answer": "objected to the statement",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the judge's action?",
              "answer": "the police officer sentencing the firefighter which led to the firefighter reading rights to the teacher which led to the teacher rescuing the mailman which led to the mailman assigning homework to the surgeon which led to the surgeon delivering mail to the lawyer which led to the lawyer incising the judge",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the judge's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "judge",
              "is_middle_entity": false
            }
          ],
          "surgeon": [
            {
              "question": "What did the surgeon do?",
              "answer": "deliver mail to the lawyer",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "Who assigned homework to the surgeon?",
              "answer": "the mailman",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was assigned homework do?",
              "answer": "delivered mail to the lawyer",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the surgeon's action?",
              "answer": "the police officer sentencing the firefighter which led to the firefighter reading rights to the teacher which led to the teacher rescuing the mailman which led to the mailman assigning homework to the surgeon",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the surgeon's involvement?",
              "answer": "the lawyer incised the judge",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "surgeon",
              "is_middle_entity": false
            }
          ],
          "firefighter": [
            {
              "question": "What did the firefighter do?",
              "answer": "read rights to the teacher",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "Who sentenced the firefighter?",
              "answer": "the police officer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was sentenced do?",
              "answer": "read rights to the teacher",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the firefighter's action?",
              "answer": "the police officer sentencing the firefighter",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the firefighter's involvement?",
              "answer": "the teacher rescued the mailman",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "firefighter",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 42
      },
      {
        "id": "complexity_6_sentence_3",
        "sentence": "The shark that the grasshopper that the cobra that the elephant that the mouse that the worm that the starfish attacked crawled toward wriggled toward scurried toward charged at hissed at chirped.",
        "structure": [
          {
            "subject": "shark",
            "action": "chirped",
            "object": null
          },
          {
            "subject": "grasshopper",
            "action": "hissed at",
            "object": "shark"
          },
          {
            "subject": "cobra",
            "action": "charged at",
            "object": "grasshopper"
          },
          {
            "subject": "elephant",
            "action": "scurried toward",
            "object": "cobra"
          },
          {
            "subject": "mouse",
            "action": "wriggled toward",
            "object": "elephant"
          },
          {
            "subject": "worm",
            "action": "crawled toward",
            "object": "mouse"
          },
          {
            "subject": "starfish",
            "action": "attacked",
            "object": "worm"
          }
        ],
        "middle_entity": "elephant",
        "all_entities": [
          "worm",
          "cobra",
          "starfish",
          "elephant",
          "shark",
          "mouse",
          "grasshopper"
        ],
        "questions_by_entity": {
          "worm": [
            {
              "question": "What did the worm do?",
              "answer": "crawl toward the mouse",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "worm",
              "is_middle_entity": false
            },
            {
              "question": "What attacked the worm?",
              "answer": "the starfish",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "worm",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "worm",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was attacked do?",
              "answer": "crawled toward the mouse",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "worm",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the worm's action?",
              "answer": "the starfish attacking the worm",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "worm",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the worm's involvement?",
              "answer": "the mouse wriggled toward the elephant",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "worm",
              "is_middle_entity": false
            }
          ],
          "cobra": [
            {
              "question": "What did the cobra do?",
              "answer": "charge at the grasshopper",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "cobra",
              "is_middle_entity": false
            },
            {
              "question": "What scurried toward the cobra?",
              "answer": "the elephant",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "cobra",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "cobra",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was scurried toward do?",
              "answer": "charged at the grasshopper",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "cobra",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the cobra's action?",
              "answer": "the starfish attacking the worm which led to the worm crawling toward the mouse which led to the mouse wriggling toward the elephant which led to the elephant scurrying toward the cobra",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "cobra",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the cobra's involvement?",
              "answer": "the grasshopper hissed at the shark",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "cobra",
              "is_middle_entity": false
            }
          ],
          "starfish": [
            {
              "question": "What did the starfish do?",
              "answer": "attack the worm",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "starfish",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the starfish?",
              "answer": "the worm",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "starfish",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "starfish",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the starfish do?",
              "answer": "crawled toward the mouse",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "starfish",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the starfish's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "starfish",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the starfish's involvement?",
              "answer": "the worm crawled toward the mouse",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "starfish",
              "is_middle_entity": false
            }
          ],
          "elephant": [
            {
              "question": "What did the elephant do?",
              "answer": "scurry toward the cobra",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "elephant",
              "is_middle_entity": true
            },
            {
              "question": "What wriggled toward the elephant?",
              "answer": "the mouse",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "elephant",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "elephant",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was wriggled toward do?",
              "answer": "scurried toward the cobra",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "elephant",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the elephant's action?",
              "answer": "the starfish attacking the worm which led to the worm crawling toward the mouse which led to the mouse wriggling toward the elephant",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "elephant",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the elephant's involvement?",
              "answer": "the cobra charged at the grasshopper",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "elephant",
              "is_middle_entity": true
            }
          ],
          "shark": [
            {
              "question": "What did the shark do?",
              "answer": "chirp",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "shark",
              "is_middle_entity": false
            },
            {
              "question": "What hissed at the shark?",
              "answer": "the grasshopper",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "shark",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "shark",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was hissed at do?",
              "answer": "chirped",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "shark",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the shark's action?",
              "answer": "the starfish attacking the worm which led to the worm crawling toward the mouse which led to the mouse wriggling toward the elephant which led to the elephant scurrying toward the cobra which led to the cobra charging at the grasshopper which led to the grasshopper hissing at the shark",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "shark",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the shark's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "shark",
              "is_middle_entity": false
            }
          ],
          "mouse": [
            {
              "question": "What did the mouse do?",
              "answer": "wriggle toward the elephant",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "mouse",
              "is_middle_entity": false
            },
            {
              "question": "What crawled toward the mouse?",
              "answer": "the worm",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "mouse",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "mouse",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was crawled toward do?",
              "answer": "wriggled toward the elephant",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "mouse",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the mouse's action?",
              "answer": "the starfish attacking the worm which led to the worm crawling toward the mouse",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "mouse",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the mouse's involvement?",
              "answer": "the elephant scurried toward the cobra",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "mouse",
              "is_middle_entity": false
            }
          ],
          "grasshopper": [
            {
              "question": "What did the grasshopper do?",
              "answer": "hiss at the shark",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "grasshopper",
              "is_middle_entity": false
            },
            {
              "question": "What charged at the grasshopper?",
              "answer": "the cobra",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "grasshopper",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "grasshopper",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was charged at do?",
              "answer": "hissed at the shark",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "grasshopper",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the grasshopper's action?",
              "answer": "the starfish attacking the worm which led to the worm crawling toward the mouse which led to the mouse wriggling toward the elephant which led to the elephant scurrying toward the cobra which led to the cobra charging at the grasshopper",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "grasshopper",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the grasshopper's involvement?",
              "answer": "the shark chirped",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "grasshopper",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 42
      },
      {
        "id": "complexity_6_sentence_4",
        "sentence": "The motorcycle that the ambulance that the airplane that the train that the boat that the bicycle that the spaceship lane-split past orbited cycled around moored to whistled at strafed blared the siren.",
        "structure": [
          {
            "subject": "motorcycle",
            "action": "blared the siren",
            "object": null
          },
          {
            "subject": "ambulance",
            "action": "strafed",
            "object": "motorcycle"
          },
          {
            "subject": "airplane",
            "action": "whistled at",
            "object": "ambulance"
          },
          {
            "subject": "train",
            "action": "moored to",
            "object": "airplane"
          },
          {
            "subject": "boat",
            "action": "cycled around",
            "object": "train"
          },
          {
            "subject": "bicycle",
            "action": "orbited",
            "object": "boat"
          },
          {
            "subject": "spaceship",
            "action": "lane-split past",
            "object": "bicycle"
          }
        ],
        "middle_entity": "train",
        "all_entities": [
          "airplane",
          "ambulance",
          "train",
          "boat",
          "bicycle",
          "motorcycle",
          "spaceship"
        ],
        "questions_by_entity": {
          "airplane": [
            {
              "question": "What did the airplane do?",
              "answer": "whistle at the ambulance",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What moored to the airplane?",
              "answer": "the train",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was moored do?",
              "answer": "whistled at the ambulance",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the airplane's action?",
              "answer": "the spaceship lane-splitting past the bicycle which led to the bicycle orbiting the boat which led to the boat cycling around the train which led to the train mooring to the airplane",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the airplane's involvement?",
              "answer": "the ambulance strafed the motorcycle",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            }
          ],
          "ambulance": [
            {
              "question": "What did the ambulance do?",
              "answer": "strafe the motorcycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What whistled at the ambulance?",
              "answer": "the airplane",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was whistled at do?",
              "answer": "strafed the motorcycle",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the ambulance's action?",
              "answer": "the spaceship lane-splitting past the bicycle which led to the bicycle orbiting the boat which led to the boat cycling around the train which led to the train mooring to the airplane which led to the airplane whistling at the ambulance",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the ambulance's involvement?",
              "answer": "the motorcycle blared the siren",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": false
            }
          ],
          "train": [
            {
              "question": "What did the train do?",
              "answer": "moor to the airplane",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": true
            },
            {
              "question": "What cycled around the train?",
              "answer": "the boat",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was cycled around do?",
              "answer": "moored to the airplane",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the train's action?",
              "answer": "the spaceship lane-splitting past the bicycle which led to the bicycle orbiting the boat which led to the boat cycling around the train",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the train's involvement?",
              "answer": "the airplane whistled at the ambulance",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": true
            }
          ],
          "boat": [
            {
              "question": "What did the boat do?",
              "answer": "cycle around the train",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What orbited the boat?",
              "answer": "the bicycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was orbited do?",
              "answer": "cycled around the train",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the boat's action?",
              "answer": "the spaceship lane-splitting past the bicycle which led to the bicycle orbiting the boat",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the boat's involvement?",
              "answer": "the train moored to the airplane",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            }
          ],
          "bicycle": [
            {
              "question": "What did the bicycle do?",
              "answer": "orbit the boat",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What lane-split past the bicycle?",
              "answer": "the spaceship",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was lane-split past do?",
              "answer": "orbited the boat",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the bicycle's action?",
              "answer": "the spaceship lane-splitting past the bicycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the bicycle's involvement?",
              "answer": "the boat cycled around the train",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": false
            }
          ],
          "motorcycle": [
            {
              "question": "What did the motorcycle do?",
              "answer": "blared the siren",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What strafed the motorcycle?",
              "answer": "the ambulance",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was strafed do?",
              "answer": "blared the siren",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the motorcycle's action?",
              "answer": "the spaceship lane-splitting past the bicycle which led to the bicycle orbiting the boat which led to the boat cycling around the train which led to the train mooring to the airplane which led to the airplane whistling at the ambulance which led to the ambulance strafing the motorcycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the motorcycle's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": false
            }
          ],
          "spaceship": [
            {
              "question": "What did the spaceship do?",
              "answer": "lane-split past the bicycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the spaceship?",
              "answer": "the bicycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the spaceship do?",
              "answer": "orbited the boat",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the spaceship's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the spaceship's involvement?",
              "answer": "the bicycle orbited the boat",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 42
      },
      {
        "id": "complexity_6_sentence_5",
        "sentence": "The boat that the truck that the train that the motorcycle that the ambulance that the spaceship that the airplane anchored near strafed orbited blared the siren at wheelied at whistled at jackknifed.",
        "structure": [
          {
            "subject": "boat",
            "action": "jackknifed",
            "object": null
          },
          {
            "subject": "truck",
            "action": "whistled at",
            "object": "boat"
          },
          {
            "subject": "train",
            "action": "wheelied at",
            "object": "truck"
          },
          {
            "subject": "motorcycle",
            "action": "blared the siren at",
            "object": "train"
          },
          {
            "subject": "ambulance",
            "action": "orbited",
            "object": "motorcycle"
          },
          {
            "subject": "spaceship",
            "action": "strafed",
            "object": "ambulance"
          },
          {
            "subject": "airplane",
            "action": "anchored near",
            "object": "spaceship"
          }
        ],
        "middle_entity": "motorcycle",
        "all_entities": [
          "airplane",
          "ambulance",
          "train",
          "boat",
          "motorcycle",
          "truck",
          "spaceship"
        ],
        "questions_by_entity": {
          "airplane": [
            {
              "question": "What did the airplane do?",
              "answer": "anchor near the spaceship",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the airplane?",
              "answer": "the spaceship",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the airplane do?",
              "answer": "strafed the ambulance",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the airplane's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the airplane's involvement?",
              "answer": "the spaceship strafed the ambulance",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            }
          ],
          "ambulance": [
            {
              "question": "What did the ambulance do?",
              "answer": "orbit the motorcycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What strafed the ambulance?",
              "answer": "the spaceship",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was strafed do?",
              "answer": "orbited the motorcycle",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the ambulance's action?",
              "answer": "the airplane anchoring near the spaceship which led to the spaceship strafing the ambulance",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the ambulance's involvement?",
              "answer": "the motorcycle blared the siren at the train",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": false
            }
          ],
          "train": [
            {
              "question": "What did the train do?",
              "answer": "wheelie at the truck",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What blared the siren at the train?",
              "answer": "the motorcycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was blared the siren at do?",
              "answer": "wheelied at the truck",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the train's action?",
              "answer": "the airplane anchoring near the spaceship which led to the spaceship strafing the ambulance which led to the ambulance orbiting the motorcycle which led to the motorcycle blaring the siren at the train",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the train's involvement?",
              "answer": "the truck whistled at the boat",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            }
          ],
          "boat": [
            {
              "question": "What did the boat do?",
              "answer": "jackknife",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What whistled at the boat?",
              "answer": "the truck",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was whistled at do?",
              "answer": "jackknifed",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the boat's action?",
              "answer": "the airplane anchoring near the spaceship which led to the spaceship strafing the ambulance which led to the ambulance orbiting the motorcycle which led to the motorcycle blaring the siren at the train which led to the train doing a wheelie at the truck which led to the truck whistling at the boat",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the boat's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            }
          ],
          "motorcycle": [
            {
              "question": "What did the motorcycle do?",
              "answer": "blared the siren at the train",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "What orbited the motorcycle?",
              "answer": "the ambulance",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was orbited do?",
              "answer": "blared the siren at the train",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the motorcycle's action?",
              "answer": "the airplane anchoring near the spaceship which led to the spaceship strafing the ambulance which led to the ambulance orbiting the motorcycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the motorcycle's involvement?",
              "answer": "the train wheelied at the truck",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": true
            }
          ],
          "truck": [
            {
              "question": "What did the truck do?",
              "answer": "whistle at the boat",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What wheelied at the truck?",
              "answer": "the train",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was wheelied at do?",
              "answer": "whistled at the boat",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the truck's action?",
              "answer": "the airplane anchoring near the spaceship which led to the spaceship strafing the ambulance which led to the ambulance orbiting the motorcycle which led to the motorcycle blaring the siren at the train which led to the train doing a wheelie at the truck",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the truck's involvement?",
              "answer": "the boat jackknifed",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            }
          ],
          "spaceship": [
            {
              "question": "What did the spaceship do?",
              "answer": "strafe the ambulance",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What anchored near the spaceship?",
              "answer": "the airplane",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was anchored near do?",
              "answer": "strafed the ambulance",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the spaceship's action?",
              "answer": "the airplane anchoring near the spaceship",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the spaceship's involvement?",
              "answer": "the ambulance orbited the motorcycle",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 42
      },
      {
        "id": "complexity_6_sentence_6",
        "sentence": "The boat that the airplane that the spaceship that the motorcycle that the train that the truck that the bicycle sailed past cycled around jackknifed into whistled at wheelied at orbited taxied.",
        "structure": [
          {
            "subject": "boat",
            "action": "taxied",
            "object": null
          },
          {
            "subject": "airplane",
            "action": "orbited",
            "object": "boat"
          },
          {
            "subject": "spaceship",
            "action": "wheelied at",
            "object": "airplane"
          },
          {
            "subject": "motorcycle",
            "action": "whistled at",
            "object": "spaceship"
          },
          {
            "subject": "train",
            "action": "jackknifed into",
            "object": "motorcycle"
          },
          {
            "subject": "truck",
            "action": "cycled around",
            "object": "train"
          },
          {
            "subject": "bicycle",
            "action": "sailed past",
            "object": "truck"
          }
        ],
        "middle_entity": "motorcycle",
        "all_entities": [
          "airplane",
          "train",
          "boat",
          "bicycle",
          "truck",
          "motorcycle",
          "spaceship"
        ],
        "questions_by_entity": {
          "airplane": [
            {
              "question": "What did the airplane do?",
              "answer": "orbit the boat",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What wheelied at the airplane?",
              "answer": "the spaceship",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was wheelied at do?",
              "answer": "orbited the boat",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the airplane's action?",
              "answer": "the bicycle sailing past the truck which led to the truck cycling around the train which led to the train jackknifing into the motorcycle which led to the motorcycle whistling at the spaceship which led to the spaceship doing a wheelie at the airplane",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the airplane's involvement?",
              "answer": "the boat taxied",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            }
          ],
          "train": [
            {
              "question": "What did the train do?",
              "answer": "jackknife into the motorcycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What cycled around the train?",
              "answer": "the truck",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was cycled around do?",
              "answer": "jackknifed into the motorcycle",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the train's action?",
              "answer": "the bicycle sailing past the truck which led to the truck cycling around the train",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the train's involvement?",
              "answer": "the motorcycle whistled at the spaceship",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            }
          ],
          "boat": [
            {
              "question": "What did the boat do?",
              "answer": "taxi",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What orbited the boat?",
              "answer": "the airplane",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was orbited do?",
              "answer": "taxied",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the boat's action?",
              "answer": "the bicycle sailing past the truck which led to the truck cycling around the train which led to the train jackknifing into the motorcycle which led to the motorcycle whistling at the spaceship which led to the spaceship doing a wheelie at the airplane which led to the airplane orbiting the boat",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the boat's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            }
          ],
          "bicycle": [
            {
              "question": "What did the bicycle do?",
              "answer": "sail past the truck",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the bicycle?",
              "answer": "the truck",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the bicycle do?",
              "answer": "cycled around the train",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the bicycle's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the bicycle's involvement?",
              "answer": "the truck cycled around the train",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": false
            }
          ],
          "truck": [
            {
              "question": "What did the truck do?",
              "answer": "cycle around the train",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What sailed past the truck?",
              "answer": "the bicycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was sailed past do?",
              "answer": "cycled around the train",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the truck's action?",
              "answer": "the bicycle sailing past the truck",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the truck's involvement?",
              "answer": "the train jackknifed into the motorcycle",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            }
          ],
          "motorcycle": [
            {
              "question": "What did the motorcycle do?",
              "answer": "whistle at the spaceship",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "What jackknifed into the motorcycle?",
              "answer": "the train",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was jackknifed into do?",
              "answer": "whistled at the spaceship",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the motorcycle's action?",
              "answer": "the bicycle sailing past the truck which led to the truck cycling around the train which led to the train jackknifing into the motorcycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the motorcycle's involvement?",
              "answer": "the spaceship wheelied at the airplane",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": true
            }
          ],
          "spaceship": [
            {
              "question": "What did the spaceship do?",
              "answer": "wheelie at the airplane",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What whistled at the spaceship?",
              "answer": "the motorcycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was whistled at do?",
              "answer": "wheelied at the airplane",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the spaceship's action?",
              "answer": "the bicycle sailing past the truck which led to the truck cycling around the train which led to the train jackknifing into the motorcycle which led to the motorcycle whistling at the spaceship",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the spaceship's involvement?",
              "answer": "the airplane orbited the boat",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 42
      },
      {
        "id": "complexity_6_sentence_7",
        "sentence": "The mouse that the worm that the bat that the octopus that the shark that the pig that the spider squeaked at crawled toward snorted at attacked squeezed echolocated burrowed.",
        "structure": [
          {
            "subject": "mouse",
            "action": "burrowed",
            "object": null
          },
          {
            "subject": "worm",
            "action": "echolocated",
            "object": "mouse"
          },
          {
            "subject": "bat",
            "action": "squeezed",
            "object": "worm"
          },
          {
            "subject": "octopus",
            "action": "attacked",
            "object": "bat"
          },
          {
            "subject": "shark",
            "action": "snorted at",
            "object": "octopus"
          },
          {
            "subject": "pig",
            "action": "crawled toward",
            "object": "shark"
          },
          {
            "subject": "spider",
            "action": "squeaked at",
            "object": "pig"
          }
        ],
        "middle_entity": "octopus",
        "all_entities": [
          "bat",
          "pig",
          "worm",
          "octopus",
          "shark",
          "mouse",
          "spider"
        ],
        "questions_by_entity": {
          "bat": [
            {
              "question": "What did the bat do?",
              "answer": "squeeze the worm",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "bat",
              "is_middle_entity": false
            },
            {
              "question": "What attacked the bat?",
              "answer": "the octopus",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "bat",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "bat",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was attacked do?",
              "answer": "squeezed the worm",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "bat",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the bat's action?",
              "answer": "the spider squeaking at the pig which led to the pig crawling toward the shark which led to the shark snorting at the octopus which led to the octopus attacking the bat",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "bat",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the bat's involvement?",
              "answer": "the worm echolocated the mouse",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "bat",
              "is_middle_entity": false
            }
          ],
          "pig": [
            {
              "question": "What did the pig do?",
              "answer": "crawl toward the shark",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "pig",
              "is_middle_entity": false
            },
            {
              "question": "What squeaked at the pig?",
              "answer": "the spider",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "pig",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "pig",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was squeaked at do?",
              "answer": "crawled toward the shark",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "pig",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the pig's action?",
              "answer": "the spider squeaking at the pig",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "pig",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the pig's involvement?",
              "answer": "the shark snorted at the octopus",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "pig",
              "is_middle_entity": false
            }
          ],
          "worm": [
            {
              "question": "What did the worm do?",
              "answer": "echolocate the mouse",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "worm",
              "is_middle_entity": false
            },
            {
              "question": "What squeezed the worm?",
              "answer": "the bat",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "worm",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "worm",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was squeezed do?",
              "answer": "echolocated the mouse",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "worm",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the worm's action?",
              "answer": "the spider squeaking at the pig which led to the pig crawling toward the shark which led to the shark snorting at the octopus which led to the octopus attacking the bat which led to the bat squeezing the worm",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "worm",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the worm's involvement?",
              "answer": "the mouse burrowed",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "worm",
              "is_middle_entity": false
            }
          ],
          "octopus": [
            {
              "question": "What did the octopus do?",
              "answer": "attack the bat",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "octopus",
              "is_middle_entity": true
            },
            {
              "question": "What snorted at the octopus?",
              "answer": "the shark",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "octopus",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "octopus",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was snorted at do?",
              "answer": "attacked the bat",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "octopus",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the octopus's action?",
              "answer": "the spider squeaking at the pig which led to the pig crawling toward the shark which led to the shark snorting at the octopus",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "octopus",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the octopus's involvement?",
              "answer": "the bat squeezed the worm",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "octopus",
              "is_middle_entity": true
            }
          ],
          "shark": [
            {
              "question": "What did the shark do?",
              "answer": "snort at the octopus",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "shark",
              "is_middle_entity": false
            },
            {
              "question": "What crawled toward the shark?",
              "answer": "the pig",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "shark",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "shark",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was crawled toward do?",
              "answer": "snorted at the octopus",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "shark",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the shark's action?",
              "answer": "the spider squeaking at the pig which led to the pig crawling toward the shark",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "shark",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the shark's involvement?",
              "answer": "the octopus attacked the bat",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "shark",
              "is_middle_entity": false
            }
          ],
          "mouse": [
            {
              "question": "What did the mouse do?",
              "answer": "burrow",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "mouse",
              "is_middle_entity": false
            },
            {
              "question": "What echolocated the mouse?",
              "answer": "the worm",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "mouse",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "mouse",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was echolocated do?",
              "answer": "burrowed",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "mouse",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the mouse's action?",
              "answer": "the spider squeaking at the pig which led to the pig crawling toward the shark which led to the shark snorting at the octopus which led to the octopus attacking the bat which led to the bat squeezing the worm which led to the worm echolocating the mouse",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "mouse",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the mouse's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "mouse",
              "is_middle_entity": false
            }
          ],
          "spider": [
            {
              "question": "What did the spider do?",
              "answer": "squeak at the pig",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "spider",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the spider?",
              "answer": "the pig",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "spider",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "spider",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the spider do?",
              "answer": "crawled toward the shark",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "spider",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the spider's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "spider",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the spider's involvement?",
              "answer": "the pig crawled toward the shark",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "spider",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 42
      },
      {
        "id": "complexity_6_sentence_8",
        "sentence": "The police officer that the nurse that the photographer that the doctor that the mailman that the principal that the lawyer arrested cross-examined suspended delivered mail to examined with a stethoscope photographed nursed.",
        "structure": [
          {
            "subject": "police officer",
            "action": "nursed",
            "object": null
          },
          {
            "subject": "nurse",
            "action": "photographed",
            "object": "police officer"
          },
          {
            "subject": "photographer",
            "action": "examined with a stethoscope",
            "object": "nurse"
          },
          {
            "subject": "doctor",
            "action": "delivered mail to",
            "object": "photographer"
          },
          {
            "subject": "mailman",
            "action": "suspended",
            "object": "doctor"
          },
          {
            "subject": "principal",
            "action": "cross-examined",
            "object": "mailman"
          },
          {
            "subject": "lawyer",
            "action": "arrested",
            "object": "principal"
          }
        ],
        "middle_entity": "doctor",
        "all_entities": [
          "principal",
          "mailman",
          "doctor",
          "police officer",
          "lawyer",
          "photographer",
          "nurse"
        ],
        "questions_by_entity": {
          "principal": [
            {
              "question": "What did the principal do?",
              "answer": "cross-examine the mailman",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "Who arrested the principal?",
              "answer": "the lawyer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was arrested do?",
              "answer": "cross-examined the mailman",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the principal's action?",
              "answer": "the lawyer arresting the principal",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the principal's involvement?",
              "answer": "the mailman suspended the doctor",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "principal",
              "is_middle_entity": false
            }
          ],
          "mailman": [
            {
              "question": "What did the mailman do?",
              "answer": "suspend the doctor",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "Who cross-examined the mailman?",
              "answer": "the principal",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was cross-examined do?",
              "answer": "suspended the doctor",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the mailman's action?",
              "answer": "the lawyer arresting the principal which led to the principal cross-examining the mailman",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "mailman",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the mailman's involvement?",
              "answer": "the doctor delivered mail to the photographer",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "mailman",
              "is_middle_entity": false
            }
          ],
          "doctor": [
            {
              "question": "What did the doctor do?",
              "answer": "deliver mail to the photographer",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "doctor",
              "is_middle_entity": true
            },
            {
              "question": "Who suspended the doctor?",
              "answer": "the mailman",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "doctor",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "doctor",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was suspended do?",
              "answer": "delivered mail to the photographer",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "doctor",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the doctor's action?",
              "answer": "the lawyer arresting the principal which led to the principal cross-examining the mailman which led to the mailman suspending the doctor",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "doctor",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the doctor's involvement?",
              "answer": "the photographer examined the nurse with a stethoscope ",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "doctor",
              "is_middle_entity": true
            }
          ],
          "police officer": [
            {
              "question": "What did the police officer do?",
              "answer": "nurse",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "Who photographed the police officer?",
              "answer": "the nurse",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was photographed do?",
              "answer": "nursed",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the police officer's action?",
              "answer": "the lawyer arresting the principal which led to the principal cross-examining the mailman which led to the mailman suspending the doctor which led to the doctor delivering mail to the photographer which led to the photographer examining the nurse with a stethoscope which led to the nurse photographing the police officer",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the police officer's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "police officer",
              "is_middle_entity": false
            }
          ],
          "lawyer": [
            {
              "question": "What did the lawyer do?",
              "answer": "arrest the principal",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "Who was affected by the lawyer?",
              "answer": "the principal",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the lawyer do?",
              "answer": "cross-examined the mailman",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the lawyer's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the lawyer's involvement?",
              "answer": "the principal cross-examined the mailman",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "lawyer",
              "is_middle_entity": false
            }
          ],
          "photographer": [
            {
              "question": "What did the photographer do?",
              "answer": "examine the nurse with a stethoscope",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "Who delivered mail to the photographer?",
              "answer": "the doctor",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was delivered mail do?",
              "answer": "examined the nurse with a stethoscope",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the photographer's action?",
              "answer": "the lawyer arresting the principal which led to the principal cross-examining the mailman which led to the mailman suspending the doctor which led to the doctor delivering mail to the photographer",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the photographer's involvement?",
              "answer": "the nurse photographed the police officer",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "photographer",
              "is_middle_entity": false
            }
          ],
          "nurse": [
            {
              "question": "What did the nurse do?",
              "answer": "photograph the police officer",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "Who examined the nurse with a stethoscope?",
              "answer": "the photographer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was examined with a stethoscope do?",
              "answer": "photographed the police officer",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the nurse's action?",
              "answer": "the lawyer arresting the principal which led to the principal cross-examining the mailman which led to the mailman suspending the doctor which led to the doctor delivering mail to the photographer which led to the photographer examining the nurse with a stethoscope",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the nurse's involvement?",
              "answer": "the police officer nursed",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "nurse",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 42
      },
      {
        "id": "complexity_6_sentence_9",
        "sentence": "The airplane that the bicycle that the ambulance that the boat that the train that the motorcycle that the truck air-dropped on towed wheelied at whistled at sailed past blared the siren at pedaled.",
        "structure": [
          {
            "subject": "airplane",
            "action": "pedaled",
            "object": null
          },
          {
            "subject": "bicycle",
            "action": "blared the siren at",
            "object": "airplane"
          },
          {
            "subject": "ambulance",
            "action": "sailed past",
            "object": "bicycle"
          },
          {
            "subject": "boat",
            "action": "whistled at",
            "object": "ambulance"
          },
          {
            "subject": "train",
            "action": "wheelied at",
            "object": "boat"
          },
          {
            "subject": "motorcycle",
            "action": "towed",
            "object": "train"
          },
          {
            "subject": "truck",
            "action": "air-dropped on",
            "object": "motorcycle"
          }
        ],
        "middle_entity": "boat",
        "all_entities": [
          "airplane",
          "ambulance",
          "train",
          "boat",
          "bicycle",
          "motorcycle",
          "truck"
        ],
        "questions_by_entity": {
          "airplane": [
            {
              "question": "What did the airplane do?",
              "answer": "pedal",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What blared the siren at the airplane?",
              "answer": "the bicycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was blared the siren at do?",
              "answer": "pedaled",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the airplane's action?",
              "answer": "the truck air-dropping on the motorcycle which led to the motorcycle towing the train which led to the train doing a wheelie at the boat which led to the boat whistling at the ambulance which led to the ambulance sailing past the bicycle which led to the bicycle blaring the siren at the airplane",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the airplane's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            }
          ],
          "ambulance": [
            {
              "question": "What did the ambulance do?",
              "answer": "sail past the bicycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What whistled at the ambulance?",
              "answer": "the boat",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was whistled at do?",
              "answer": "sailed past the bicycle",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the ambulance's action?",
              "answer": "the truck air-dropping on the motorcycle which led to the motorcycle towing the train which led to the train doing a wheelie at the boat which led to the boat whistling at the ambulance",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the ambulance's involvement?",
              "answer": "the bicycle blared the siren at the airplane",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": false
            }
          ],
          "train": [
            {
              "question": "What did the train do?",
              "answer": "wheelie at the boat",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What towed the train?",
              "answer": "the motorcycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was towed do?",
              "answer": "wheelied at the boat",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the train's action?",
              "answer": "the truck air-dropping on the motorcycle which led to the motorcycle towing the train",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the train's involvement?",
              "answer": "the boat whistled at the ambulance",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            }
          ],
          "boat": [
            {
              "question": "What did the boat do?",
              "answer": "whistle at the ambulance",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": true
            },
            {
              "question": "What wheelied at the boat?",
              "answer": "the train",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was wheelied at do?",
              "answer": "whistled at the ambulance",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the boat's action?",
              "answer": "the truck air-dropping on the motorcycle which led to the motorcycle towing the train which led to the train doing a wheelie at the boat",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the boat's involvement?",
              "answer": "the ambulance sailed past the bicycle",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": true
            }
          ],
          "bicycle": [
            {
              "question": "What did the bicycle do?",
              "answer": "blared the siren at the airplane",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What sailed past the bicycle?",
              "answer": "the ambulance",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was sailed past do?",
              "answer": "blared the siren at the airplane",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the bicycle's action?",
              "answer": "the truck air-dropping on the motorcycle which led to the motorcycle towing the train which led to the train doing a wheelie at the boat which led to the boat whistling at the ambulance which led to the ambulance sailing past the bicycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the bicycle's involvement?",
              "answer": "the airplane pedaled",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": false
            }
          ],
          "motorcycle": [
            {
              "question": "What did the motorcycle do?",
              "answer": "tow the train",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What air-dropped on the motorcycle?",
              "answer": "the truck",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was air-dropped on do?",
              "answer": "towed the train",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the motorcycle's action?",
              "answer": "the truck air-dropping on the motorcycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the motorcycle's involvement?",
              "answer": "the train wheelied at the boat",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": false
            }
          ],
          "truck": [
            {
              "question": "What did the truck do?",
              "answer": "air-drop on the motorcycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the truck?",
              "answer": "the motorcycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the truck do?",
              "answer": "towed the train",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the truck's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the truck's involvement?",
              "answer": "the motorcycle towed the train",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 42
      },
      {
        "id": "complexity_6_sentence_10",
        "sentence": "The police officer that the firefighter that the lawyer that the mailman that the waiter that the teacher that the surgeon arrested sutured graded took food orders from delivered mail to defended in court rescued.",
        "structure": [
          {
            "subject": "police officer",
            "action": "rescued",
            "object": null
          },
          {
            "subject": "firefighter",
            "action": "defended in court",
            "object": "police officer"
          },
          {
            "subject": "lawyer",
            "action": "delivered mail to",
            "object": "firefighter"
          },
          {
            "subject": "mailman",
            "action": "took food orders from",
            "object": "lawyer"
          },
          {
            "subject": "waiter",
            "action": "graded",
            "object": "mailman"
          },
          {
            "subject": "teacher",
            "action": "sutured",
            "object": "waiter"
          },
          {
            "subject": "surgeon",
            "action": "arrested",
            "object": "teacher"
          }
        ],
        "middle_entity": "mailman",
        "all_entities": [
          "mailman",
          "teacher",
          "lawyer",
          "police officer",
          "waiter",
          "surgeon",
          "firefighter"
        ],
        "questions_by_entity": {
          "mailman": [
            {
              "question": "What did the mailman do?",
              "answer": "take food orders from the lawyer",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "mailman",
              "is_middle_entity": true
            },
            {
              "question": "What graded the mailman?",
              "answer": "the waiter",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "mailman",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "mailman",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was graded do?",
              "answer": "took food orders from the lawyer",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "mailman",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the mailman's action?",
              "answer": "the surgeon arresting the teacher which led to the teacher suturing the waiter which led to the waiter grading the mailman",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "mailman",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the mailman's involvement?",
              "answer": "the lawyer delivered mail to the firefighter",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "mailman",
              "is_middle_entity": true
            }
          ],
          "teacher": [
            {
              "question": "What did the teacher do?",
              "answer": "suture the waiter",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "Who arrested the teacher?",
              "answer": "the surgeon",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was arrested do?",
              "answer": "sutured the waiter",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the teacher's action?",
              "answer": "the surgeon arresting the teacher",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the teacher's involvement?",
              "answer": "the waiter graded the mailman",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "teacher",
              "is_middle_entity": false
            }
          ],
          "lawyer": [
            {
              "question": "What did the lawyer do?",
              "answer": "deliver mail to the firefighter",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "Who took food orders from the lawyer?",
              "answer": "the mailman",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity whose food orders were taken do?",
              "answer": "delivered mail to the firefighter",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the lawyer's action?",
              "answer": "the surgeon arresting the teacher which led to the teacher suturing the waiter which led to the waiter grading the mailman which led to the mailman taking food orders from the lawyer",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the lawyer's involvement?",
              "answer": "the firefighter defended in court the police officer",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "lawyer",
              "is_middle_entity": false
            }
          ],
          "police officer": [
            {
              "question": "What did the police officer do?",
              "answer": "rescue",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "Who defended in court the police officer?",
              "answer": "the firefighter",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was defended in court do?",
              "answer": "rescued",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the police officer's action?",
              "answer": "the surgeon arresting the teacher which led to the teacher suturing the waiter which led to the waiter grading the mailman which led to the mailman taking food orders from the lawyer which led to the lawyer delivering mail to the firefighter which led to the firefighter defending  the police officer in court",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the police officer's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "police officer",
              "is_middle_entity": false
            }
          ],
          "waiter": [
            {
              "question": "What did the waiter do?",
              "answer": "grade the mailman",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "Who sutured the waiter?",
              "answer": "the teacher",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was sutured do?",
              "answer": "graded the mailman",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the waiter's action?",
              "answer": "the surgeon arresting the teacher which led to the teacher suturing the waiter",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the waiter's involvement?",
              "answer": "the mailman took food orders from the lawyer",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "waiter",
              "is_middle_entity": false
            }
          ],
          "surgeon": [
            {
              "question": "What did the surgeon do?",
              "answer": "arrest the teacher",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "Who was affected by the surgeon?",
              "answer": "the teacher",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the surgeon do?",
              "answer": "sutured the waiter",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the surgeon's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the surgeon's involvement?",
              "answer": "the teacher sutured the waiter",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "surgeon",
              "is_middle_entity": false
            }
          ],
          "firefighter": [
            {
              "question": "What did the firefighter do?",
              "answer": "defend the police officer in court",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "Who delivered mail to the firefighter?",
              "answer": "the lawyer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was delivered mail do?",
              "answer": "defended in court the police officer",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the firefighter's action?",
              "answer": "the surgeon arresting the teacher which led to the teacher suturing the waiter which led to the waiter grading the mailman which led to the mailman taking food orders from the lawyer which led to the lawyer delivering mail to the firefighter",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the firefighter's involvement?",
              "answer": "the police officer rescued",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "firefighter",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 42
      },
      {
        "id": "complexity_6_sentence_11",
        "sentence": "The judge that the photographer that the doctor that the firefighter that the waiter that the police officer that the nurse gaveled bandaged arrested seated carried out diagnosed photographed.",
        "structure": [
          {
            "subject": "judge",
            "action": "photographed",
            "object": null
          },
          {
            "subject": "photographer",
            "action": "diagnosed",
            "object": "judge"
          },
          {
            "subject": "doctor",
            "action": "carried out",
            "object": "photographer"
          },
          {
            "subject": "firefighter",
            "action": "seated",
            "object": "doctor"
          },
          {
            "subject": "waiter",
            "action": "arrested",
            "object": "firefighter"
          },
          {
            "subject": "police officer",
            "action": "bandaged",
            "object": "waiter"
          },
          {
            "subject": "nurse",
            "action": "gaveled",
            "object": "police officer"
          }
        ],
        "middle_entity": "firefighter",
        "all_entities": [
          "doctor",
          "police officer",
          "waiter",
          "judge",
          "photographer",
          "nurse",
          "firefighter"
        ],
        "questions_by_entity": {
          "doctor": [
            {
              "question": "What did the doctor do?",
              "answer": "carry the photographer out ",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "doctor",
              "is_middle_entity": false
            },
            {
              "question": "Who seated the doctor?",
              "answer": "the firefighter",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "doctor",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "doctor",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was seated do?",
              "answer": "carried the photographer out ",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "doctor",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the doctor's action?",
              "answer": "the nurse gaveling the police officer which led to the police officer bandaging the waiter which led to the waiter arresting the firefighter which led to the firefighter seating the doctor",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "doctor",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the doctor's involvement?",
              "answer": "the photographer diagnosed the judge",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "doctor",
              "is_middle_entity": false
            }
          ],
          "police officer": [
            {
              "question": "What did the police officer do?",
              "answer": "bandage the waiter",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "Who gaveled the police officer?",
              "answer": "the nurse",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was gaveled do?",
              "answer": "bandaged the waiter",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the police officer's action?",
              "answer": "the nurse gaveling the police officer",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the police officer's involvement?",
              "answer": "the waiter arrested the firefighter",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "police officer",
              "is_middle_entity": false
            }
          ],
          "waiter": [
            {
              "question": "What did the waiter do?",
              "answer": "arrest the firefighter",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "Who bandaged the waiter?",
              "answer": "the police officer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was bandaged do?",
              "answer": "arrested the firefighter",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the waiter's action?",
              "answer": "the nurse gaveling the police officer which led to the police officer bandaging the waiter",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the waiter's involvement?",
              "answer": "the firefighter seated the doctor",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "waiter",
              "is_middle_entity": false
            }
          ],
          "judge": [
            {
              "question": "What did the judge do?",
              "answer": "photograph",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "Who diagnosed the judge?",
              "answer": "the photographer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was diagnosed do?",
              "answer": "photographed",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the judge's action?",
              "answer": "the nurse gaveling the police officer which led to the police officer bandaging the waiter which led to the waiter arresting the firefighter which led to the firefighter seating the doctor which led to the doctor carrying the photographer out which led to the photographer diagnosing the judge",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the judge's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "judge",
              "is_middle_entity": false
            }
          ],
          "photographer": [
            {
              "question": "What did the photographer do?",
              "answer": "diagnose the judge",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "Who carried the photographer out?",
              "answer": "the doctor",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was carried out do?",
              "answer": "diagnosed the judge",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the photographer's action?",
              "answer": "the nurse gaveling the police officer which led to the police officer bandaging the waiter which led to the waiter arresting the firefighter which led to the firefighter seating the doctor which led to the doctor carrying the photographer out ",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the photographer's involvement?",
              "answer": "the judge photographed",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "photographer",
              "is_middle_entity": false
            }
          ],
          "nurse": [
            {
              "question": "What did the nurse do?",
              "answer": "gavel the police officer",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "Who was affected by the nurse?",
              "answer": "the police officer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the nurse do?",
              "answer": "bandaged the waiter",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the nurse's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the nurse's involvement?",
              "answer": "the police officer bandaged the waiter",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "nurse",
              "is_middle_entity": false
            }
          ],
          "firefighter": [
            {
              "question": "What did the firefighter do?",
              "answer": "seat the doctor",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "firefighter",
              "is_middle_entity": true
            },
            {
              "question": "Who arrested the firefighter?",
              "answer": "the waiter",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "firefighter",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "firefighter",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was arrested do?",
              "answer": "seated the doctor",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "firefighter",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the firefighter's action?",
              "answer": "the nurse gaveling the police officer which led to the police officer bandaging the waiter which led to the waiter arresting the firefighter",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "firefighter",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the firefighter's involvement?",
              "answer": "the doctor carried out the photographer",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "firefighter",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 42
      },
      {
        "id": "complexity_6_sentence_12",
        "sentence": "The starfish that the horse that the lizard that the seagull that the vulture that the duck that the bee crawled toward stung paddled toward scavenged from dive-bombed basked toward neighed.",
        "structure": [
          {
            "subject": "starfish",
            "action": "neighed",
            "object": null
          },
          {
            "subject": "horse",
            "action": "basked toward",
            "object": "starfish"
          },
          {
            "subject": "lizard",
            "action": "dive-bombed",
            "object": "horse"
          },
          {
            "subject": "seagull",
            "action": "scavenged from",
            "object": "lizard"
          },
          {
            "subject": "vulture",
            "action": "paddled toward",
            "object": "seagull"
          },
          {
            "subject": "duck",
            "action": "stung",
            "object": "vulture"
          },
          {
            "subject": "bee",
            "action": "crawled toward",
            "object": "duck"
          }
        ],
        "middle_entity": "seagull",
        "all_entities": [
          "lizard",
          "bee",
          "starfish",
          "duck",
          "seagull",
          "vulture",
          "horse"
        ],
        "questions_by_entity": {
          "lizard": [
            {
              "question": "What did the lizard do?",
              "answer": "dive-bomb the horse",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "lizard",
              "is_middle_entity": false
            },
            {
              "question": "What scavenged from the lizard?",
              "answer": "the seagull",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "lizard",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "lizard",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was scavenged from do?",
              "answer": "dive-bombed the horse",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "lizard",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the lizard's action?",
              "answer": "the bee crawling toward the duck which led to the duck stinging the vulture which led to the vulture paddling toward the seagull which led to the seagull scavenging from the lizard",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "lizard",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the lizard's involvement?",
              "answer": "the horse basked toward the starfish",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "lizard",
              "is_middle_entity": false
            }
          ],
          "bee": [
            {
              "question": "What did the bee do?",
              "answer": "crawl toward the duck",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "bee",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the bee?",
              "answer": "the duck",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "bee",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "bee",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the bee do?",
              "answer": "stung the vulture",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "bee",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the bee's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "bee",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the bee's involvement?",
              "answer": "the duck stung the vulture",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "bee",
              "is_middle_entity": false
            }
          ],
          "starfish": [
            {
              "question": "What did the starfish do?",
              "answer": "neigh",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "starfish",
              "is_middle_entity": false
            },
            {
              "question": "What basked toward the starfish?",
              "answer": "the horse",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "starfish",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "starfish",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was basked toward do?",
              "answer": "neighed",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "starfish",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the starfish's action?",
              "answer": "the bee crawling toward the duck which led to the duck stinging the vulture which led to the vulture paddling toward the seagull which led to the seagull scavenging from the lizard which led to the lizard dive-bombing the horse which led to the horse basking toward the starfish",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "starfish",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the starfish's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "starfish",
              "is_middle_entity": false
            }
          ],
          "duck": [
            {
              "question": "What did the duck do?",
              "answer": "sting the vulture",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "duck",
              "is_middle_entity": false
            },
            {
              "question": "What crawled toward the duck?",
              "answer": "the bee",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "duck",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "duck",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was crawled toward do?",
              "answer": "stung the vulture",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "duck",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the duck's action?",
              "answer": "the bee crawling toward the duck",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "duck",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the duck's involvement?",
              "answer": "the vulture paddled toward the seagull",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "duck",
              "is_middle_entity": false
            }
          ],
          "seagull": [
            {
              "question": "What did the seagull do?",
              "answer": "scavenge from the lizard",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "seagull",
              "is_middle_entity": true
            },
            {
              "question": "What paddled toward the seagull?",
              "answer": "the vulture",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "seagull",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "seagull",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was paddled toward do?",
              "answer": "scavenged from the lizard",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "seagull",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the seagull's action?",
              "answer": "the bee crawling toward the duck which led to the duck stinging the vulture which led to the vulture paddling toward the seagull",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "seagull",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the seagull's involvement?",
              "answer": "the lizard dive-bombed the horse",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "seagull",
              "is_middle_entity": true
            }
          ],
          "vulture": [
            {
              "question": "What did the vulture do?",
              "answer": "paddle toward the seagull",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "vulture",
              "is_middle_entity": false
            },
            {
              "question": "What stung the vulture?",
              "answer": "the duck",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "vulture",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "vulture",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was stung do?",
              "answer": "paddled toward the seagull",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "vulture",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the vulture's action?",
              "answer": "the bee crawling toward the duck which led to the duck stinging the vulture",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "vulture",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the vulture's involvement?",
              "answer": "the seagull scavenged from the lizard",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "vulture",
              "is_middle_entity": false
            }
          ],
          "horse": [
            {
              "question": "What did the horse do?",
              "answer": "bask toward the starfish",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "horse",
              "is_middle_entity": false
            },
            {
              "question": "What dive-bombed the horse?",
              "answer": "the lizard",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "horse",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "horse",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was dive-bombed do?",
              "answer": "basked toward the starfish",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "horse",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the horse's action?",
              "answer": "the bee crawling toward the duck which led to the duck stinging the vulture which led to the vulture paddling toward the seagull which led to the seagull scavenging from the lizard which led to the lizard dive-bombing the horse",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "horse",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the horse's involvement?",
              "answer": "the starfish neighed",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "horse",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 42
      },
      {
        "id": "complexity_6_sentence_13",
        "sentence": "The teacher that the firefighter that the nurse that the doctor that the lawyer that the waiter that the police officer graded read rights to served subpoenaed prescribed medicine to bandaged rescued.",
        "structure": [
          {
            "subject": "teacher",
            "action": "rescued",
            "object": null
          },
          {
            "subject": "firefighter",
            "action": "bandaged",
            "object": "teacher"
          },
          {
            "subject": "nurse",
            "action": "prescribed medicine to",
            "object": "firefighter"
          },
          {
            "subject": "doctor",
            "action": "subpoenaed",
            "object": "nurse"
          },
          {
            "subject": "lawyer",
            "action": "served",
            "object": "doctor"
          },
          {
            "subject": "waiter",
            "action": "read rights to",
            "object": "lawyer"
          },
          {
            "subject": "police officer",
            "action": "graded",
            "object": "waiter"
          }
        ],
        "middle_entity": "doctor",
        "all_entities": [
          "doctor",
          "teacher",
          "lawyer",
          "waiter",
          "police officer",
          "nurse",
          "firefighter"
        ],
        "questions_by_entity": {
          "doctor": [
            {
              "question": "What did the doctor do?",
              "answer": "subpoena the nurse",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "doctor",
              "is_middle_entity": true
            },
            {
              "question": "Who served the doctor?",
              "answer": "the lawyer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "doctor",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "doctor",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was served do?",
              "answer": "subpoenaed the nurse",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "doctor",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the doctor's action?",
              "answer": "the police officer grading the waiter which led to the waiter reading rights to the lawyer which led to the lawyer serving the doctor",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "doctor",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the doctor's involvement?",
              "answer": "the nurse prescribed medicine to the firefighter",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "doctor",
              "is_middle_entity": true
            }
          ],
          "teacher": [
            {
              "question": "What did the teacher do?",
              "answer": "rescue",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "Who bandaged the teacher?",
              "answer": "the firefighter",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was bandaged do?",
              "answer": "rescued",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the teacher's action?",
              "answer": "the police officer grading the waiter which led to the waiter reading rights to the lawyer which led to the lawyer serving the doctor which led to the doctor subpoenaing the nurse which led to the nurse prescribing medicine to the firefighter which led to the firefighter bandaging the teacher",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "teacher",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the teacher's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "teacher",
              "is_middle_entity": false
            }
          ],
          "lawyer": [
            {
              "question": "What did the lawyer do?",
              "answer": "serve the doctor",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "Who read rights to the lawyer?",
              "answer": "the waiter",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was read rights do?",
              "answer": "served the doctor",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the lawyer's action?",
              "answer": "the police officer grading the waiter which led to the waiter reading rights to the lawyer",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the lawyer's involvement?",
              "answer": "the doctor subpoenaed the nurse",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "lawyer",
              "is_middle_entity": false
            }
          ],
          "waiter": [
            {
              "question": "What did the waiter do?",
              "answer": "read rights to the lawyer",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "Who graded the waiter?",
              "answer": "the police officer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was graded do?",
              "answer": "read rights to the lawyer",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the waiter's action?",
              "answer": "the police officer grading the waiter",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the waiter's involvement?",
              "answer": "the lawyer served the doctor",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "waiter",
              "is_middle_entity": false
            }
          ],
          "police officer": [
            {
              "question": "What did the police officer do?",
              "answer": "grade the waiter",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "Who was affected by the police officer?",
              "answer": "the waiter",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the police officer do?",
              "answer": "read rights to the lawyer",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the police officer's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the police officer's involvement?",
              "answer": "the waiter read rights to the lawyer",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "police officer",
              "is_middle_entity": false
            }
          ],
          "nurse": [
            {
              "question": "What did the nurse do?",
              "answer": "prescribe medicine to the firefighter",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "Who subpoenaed the nurse?",
              "answer": "the doctor",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was subpoenaed do?",
              "answer": "prescribed medicine to the firefighter",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the nurse's action?",
              "answer": "the police officer grading the waiter which led to the waiter reading rights to the lawyer which led to the lawyer serving the doctor which led to the doctor subpoenaing the nurse",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "nurse",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the nurse's involvement?",
              "answer": "the firefighter bandaged the teacher",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "nurse",
              "is_middle_entity": false
            }
          ],
          "firefighter": [
            {
              "question": "What did the firefighter do?",
              "answer": "bandage the teacher",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "Who prescribed medicine to the firefighter?",
              "answer": "the nurse",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was prescribed medicine to do?",
              "answer": "bandaged the teacher",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the firefighter's action?",
              "answer": "the police officer grading the waiter which led to the waiter reading rights to the lawyer which led to the lawyer serving the doctor which led to the doctor subpoenaing the nurse which led to the nurse prescribing to the firefighter",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the firefighter's involvement?",
              "answer": "the teacher rescued",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "firefighter",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 42
      },
      {
        "id": "complexity_6_sentence_14",
        "sentence": "The train that the spaceship that the bicycle that the truck that the ambulance that the boat that the airplane whistled at strafed sailed past blared the siren at towed pedaled past orbited.",
        "structure": [
          {
            "subject": "train",
            "action": "orbited",
            "object": null
          },
          {
            "subject": "spaceship",
            "action": "pedaled past",
            "object": "train"
          },
          {
            "subject": "bicycle",
            "action": "towed",
            "object": "spaceship"
          },
          {
            "subject": "truck",
            "action": "blared the siren at",
            "object": "bicycle"
          },
          {
            "subject": "ambulance",
            "action": "sailed past",
            "object": "truck"
          },
          {
            "subject": "boat",
            "action": "strafed",
            "object": "ambulance"
          },
          {
            "subject": "airplane",
            "action": "whistled at",
            "object": "boat"
          }
        ],
        "middle_entity": "truck",
        "all_entities": [
          "airplane",
          "ambulance",
          "train",
          "boat",
          "bicycle",
          "spaceship",
          "truck"
        ],
        "questions_by_entity": {
          "airplane": [
            {
              "question": "What did the airplane do?",
              "answer": "whistle at the boat",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the airplane?",
              "answer": "the boat",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the airplane do?",
              "answer": "strafed the ambulance",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the airplane's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the airplane's involvement?",
              "answer": "the boat strafed the ambulance",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            }
          ],
          "ambulance": [
            {
              "question": "What did the ambulance do?",
              "answer": "sail past the truck",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What strafed the ambulance?",
              "answer": "the boat",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was strafed do?",
              "answer": "sailed past the truck",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the ambulance's action?",
              "answer": "the airplane whistling at the boat which led to the boat strafing the ambulance",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the ambulance's involvement?",
              "answer": "the truck blared the siren at the bicycle",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": false
            }
          ],
          "train": [
            {
              "question": "What did the train do?",
              "answer": "orbit",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What pedaled past the train?",
              "answer": "the spaceship",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was pedaled past do?",
              "answer": "orbited",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the train's action?",
              "answer": "the airplane whistling at the boat which led to the boat strafing the ambulance which led to the ambulance sailing past the truck which led to the truck blaring the siren at the bicycle which led to the bicycle towing the spaceship which led to the spaceship pedaling past the train",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the train's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            }
          ],
          "boat": [
            {
              "question": "What did the boat do?",
              "answer": "strafe the ambulance",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What whistled at the boat?",
              "answer": "the airplane",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was whistled at do?",
              "answer": "strafed the ambulance",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the boat's action?",
              "answer": "the airplane whistling at the boat",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the boat's involvement?",
              "answer": "the ambulance sailed past the truck",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            }
          ],
          "bicycle": [
            {
              "question": "What did the bicycle do?",
              "answer": "tow the spaceship",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What blared the siren at the bicycle?",
              "answer": "the truck",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was blared the siren at do?",
              "answer": "towed the spaceship",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the bicycle's action?",
              "answer": "the airplane whistling at the boat which led to the boat strafing the ambulance which led to the ambulance sailing past the truck which led to the truck blaring the siren at the bicycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the bicycle's involvement?",
              "answer": "the spaceship pedaled past the train",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": false
            }
          ],
          "spaceship": [
            {
              "question": "What did the spaceship do?",
              "answer": "pedal past the train",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What towed the spaceship?",
              "answer": "the bicycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was towed do?",
              "answer": "pedaled past the train",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the spaceship's action?",
              "answer": "the airplane whistling at the boat which led to the boat strafing the ambulance which led to the ambulance sailing past the truck which led to the truck blaring the siren at the bicycle which led to the bicycle towing the spaceship",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the spaceship's involvement?",
              "answer": "the train orbited",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            }
          ],
          "truck": [
            {
              "question": "What did the truck do?",
              "answer": "blared the siren at the bicycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": true
            },
            {
              "question": "What sailed past the truck?",
              "answer": "the ambulance",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was sailed past do?",
              "answer": "blared the siren at the bicycle",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the truck's action?",
              "answer": "the airplane whistling at the boat which led to the boat strafing the ambulance which led to the ambulance sailing past the truck",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the truck's involvement?",
              "answer": "the bicycle towed the spaceship",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 42
      },
      {
        "id": "complexity_6_sentence_15",
        "sentence": "The train that the spaceship that the motorcycle that the boat that the truck that the airplane that the ambulance whistled at blared the siren at strafed towed moored to wheelied at launched.",
        "structure": [
          {
            "subject": "train",
            "action": "launched",
            "object": null
          },
          {
            "subject": "spaceship",
            "action": "wheelied at",
            "object": "train"
          },
          {
            "subject": "motorcycle",
            "action": "moored to",
            "object": "spaceship"
          },
          {
            "subject": "boat",
            "action": "towed",
            "object": "motorcycle"
          },
          {
            "subject": "truck",
            "action": "strafed",
            "object": "boat"
          },
          {
            "subject": "airplane",
            "action": "blared the siren at",
            "object": "truck"
          },
          {
            "subject": "ambulance",
            "action": "whistled at",
            "object": "airplane"
          }
        ],
        "middle_entity": "boat",
        "all_entities": [
          "airplane",
          "ambulance",
          "train",
          "boat",
          "truck",
          "motorcycle",
          "spaceship"
        ],
        "questions_by_entity": {
          "airplane": [
            {
              "question": "What did the airplane do?",
              "answer": "blared the siren at the truck",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What whistled at the airplane?",
              "answer": "the ambulance",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was whistled at do?",
              "answer": "blared the siren at the truck",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the airplane's action?",
              "answer": "the ambulance whistling at the airplane",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the airplane's involvement?",
              "answer": "the truck strafed the boat",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            }
          ],
          "ambulance": [
            {
              "question": "What did the ambulance do?",
              "answer": "whistle at the airplane",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the ambulance?",
              "answer": "the airplane",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the ambulance do?",
              "answer": "blared the siren at the truck",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the ambulance's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the ambulance's involvement?",
              "answer": "the airplane blared the siren at the truck",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": false
            }
          ],
          "train": [
            {
              "question": "What did the train do?",
              "answer": "launch",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What wheelied at the train?",
              "answer": "the spaceship",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was wheelied at do?",
              "answer": "launched",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the train's action?",
              "answer": "the ambulance whistling at the airplane which led to the airplane blaring the siren at the truck which led to the truck strafing the boat which led to the boat towing the motorcycle which led to the motorcycle mooring to the spaceship which led to the spaceship doing a wheelie at the train",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the train's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            }
          ],
          "boat": [
            {
              "question": "What did the boat do?",
              "answer": "tow the motorcycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": true
            },
            {
              "question": "What strafed the boat?",
              "answer": "the truck",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was strafed do?",
              "answer": "towed the motorcycle",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the boat's action?",
              "answer": "the ambulance whistling at the airplane which led to the airplane blaring the siren at the truck which led to the truck strafing the boat",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the boat's involvement?",
              "answer": "the motorcycle moored to the spaceship",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": true
            }
          ],
          "truck": [
            {
              "question": "What did the truck do?",
              "answer": "strafe the boat",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What blared the siren at the truck?",
              "answer": "the airplane",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was blared the siren at do?",
              "answer": "strafed the boat",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the truck's action?",
              "answer": "the ambulance whistling at the airplane which led to the airplane blaring the siren at the truck",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the truck's involvement?",
              "answer": "the boat towed the motorcycle",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            }
          ],
          "motorcycle": [
            {
              "question": "What did the motorcycle do?",
              "answer": "moor to the spaceship",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What towed the motorcycle?",
              "answer": "the boat",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was towed do?",
              "answer": "moored to the spaceship",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the motorcycle's action?",
              "answer": "the ambulance whistling at the airplane which led to the airplane blaring the siren at the truck which led to the truck strafing the boat which led to the boat towing the motorcycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the motorcycle's involvement?",
              "answer": "the spaceship wheelied at the train",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": false
            }
          ],
          "spaceship": [
            {
              "question": "What did the spaceship do?",
              "answer": "wheelie at the train",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What moored to the spaceship?",
              "answer": "the motorcycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was moored do?",
              "answer": "wheelied at the train",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the spaceship's action?",
              "answer": "the ambulance whistling at the airplane which led to the airplane blaring the siren at the truck which led to the truck strafing the boat which led to the boat towing the motorcycle which led to the motorcycle mooring to the spaceship",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the spaceship's involvement?",
              "answer": "the train launched",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 42
      },
      {
        "id": "complexity_6_sentence_16",
        "sentence": "The lizard that the horse that the deer that the worm that the lion that the crab that the skunk basked toward sprayed at scuttled toward prowled toward wriggled toward bounded toward neighed.",
        "structure": [
          {
            "subject": "lizard",
            "action": "neighed",
            "object": null
          },
          {
            "subject": "horse",
            "action": "bounded toward",
            "object": "lizard"
          },
          {
            "subject": "deer",
            "action": "wriggled toward",
            "object": "horse"
          },
          {
            "subject": "worm",
            "action": "prowled toward",
            "object": "deer"
          },
          {
            "subject": "lion",
            "action": "scuttled toward",
            "object": "worm"
          },
          {
            "subject": "crab",
            "action": "sprayed at",
            "object": "lion"
          },
          {
            "subject": "skunk",
            "action": "basked toward",
            "object": "crab"
          }
        ],
        "middle_entity": "worm",
        "all_entities": [
          "lizard",
          "worm",
          "deer",
          "crab",
          "skunk",
          "lion",
          "horse"
        ],
        "questions_by_entity": {
          "lizard": [
            {
              "question": "What did the lizard do?",
              "answer": "neigh",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "lizard",
              "is_middle_entity": false
            },
            {
              "question": "What bounded toward the lizard?",
              "answer": "the horse",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "lizard",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "lizard",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was bounded toward do?",
              "answer": "neighed",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "lizard",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the lizard's action?",
              "answer": "the skunk basking toward the crab which led to the crab spraying at the lion which led to the lion scuttling toward the worm which led to the worm prowling toward the deer which led to the deer wriggling toward the horse which led to the horse bounding toward the lizard",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "lizard",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the lizard's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "lizard",
              "is_middle_entity": false
            }
          ],
          "worm": [
            {
              "question": "What did the worm do?",
              "answer": "prowl toward the deer",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "worm",
              "is_middle_entity": true
            },
            {
              "question": "What scuttled toward the worm?",
              "answer": "the lion",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "worm",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "worm",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was scuttled toward do?",
              "answer": "prowled toward the deer",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "worm",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the worm's action?",
              "answer": "the skunk basking toward the crab which led to the crab spraying at the lion which led to the lion scuttling toward the worm",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "worm",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the worm's involvement?",
              "answer": "the deer wriggled toward the horse",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "worm",
              "is_middle_entity": true
            }
          ],
          "deer": [
            {
              "question": "What did the deer do?",
              "answer": "wriggle toward the horse",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "deer",
              "is_middle_entity": false
            },
            {
              "question": "What prowled toward the deer?",
              "answer": "the worm",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "deer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "deer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was prowled toward do?",
              "answer": "wriggled toward the horse",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "deer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the deer's action?",
              "answer": "the skunk basking toward the crab which led to the crab spraying at the lion which led to the lion scuttling toward the worm which led to the worm prowling toward the deer",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "deer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the deer's involvement?",
              "answer": "the horse bounded toward the lizard",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "deer",
              "is_middle_entity": false
            }
          ],
          "crab": [
            {
              "question": "What did the crab do?",
              "answer": "spray at the lion",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "crab",
              "is_middle_entity": false
            },
            {
              "question": "What basked toward the crab?",
              "answer": "the skunk",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "crab",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "crab",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was basked toward do?",
              "answer": "sprayed at the lion",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "crab",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the crab's action?",
              "answer": "the skunk basking toward the crab",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "crab",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the crab's involvement?",
              "answer": "the lion scuttled toward the worm",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "crab",
              "is_middle_entity": false
            }
          ],
          "skunk": [
            {
              "question": "What did the skunk do?",
              "answer": "bask toward the crab",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "skunk",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the skunk?",
              "answer": "the crab",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "skunk",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "skunk",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the skunk do?",
              "answer": "sprayed at the lion",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "skunk",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the skunk's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "skunk",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the skunk's involvement?",
              "answer": "the crab sprayed at the lion",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "skunk",
              "is_middle_entity": false
            }
          ],
          "lion": [
            {
              "question": "What did the lion do?",
              "answer": "scuttle toward the worm",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "lion",
              "is_middle_entity": false
            },
            {
              "question": "What sprayed at the lion?",
              "answer": "the crab",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "lion",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "lion",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was sprayed at do?",
              "answer": "scuttled toward the worm",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "lion",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the lion's action?",
              "answer": "the skunk basking toward the crab which led to the crab spraying at the lion",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "lion",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the lion's involvement?",
              "answer": "the worm prowled toward the deer",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "lion",
              "is_middle_entity": false
            }
          ],
          "horse": [
            {
              "question": "What did the horse do?",
              "answer": "bound toward the lizard",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "horse",
              "is_middle_entity": false
            },
            {
              "question": "What wriggled toward the horse?",
              "answer": "the deer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "horse",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "horse",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was wriggled toward do?",
              "answer": "bounded toward the lizard",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "horse",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the horse's action?",
              "answer": "the skunk basking toward the crab which led to the crab spraying at the lion which led to the lion scuttling toward the worm which led to the worm prowling toward the deer which led to the deer wriggling toward the horse",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "horse",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the horse's involvement?",
              "answer": "the lizard neighed",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "horse",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 42
      },
      {
        "id": "complexity_6_sentence_17",
        "sentence": "The train that the ambulance that the airplane that the motorcycle that the boat that the spaceship that the truck whistled at towed orbited moored to wheelied at strafed blared the siren.",
        "structure": [
          {
            "subject": "train",
            "action": "blared the siren",
            "object": null
          },
          {
            "subject": "ambulance",
            "action": "strafed",
            "object": "train"
          },
          {
            "subject": "airplane",
            "action": "wheelied at",
            "object": "ambulance"
          },
          {
            "subject": "motorcycle",
            "action": "moored to",
            "object": "airplane"
          },
          {
            "subject": "boat",
            "action": "orbited",
            "object": "motorcycle"
          },
          {
            "subject": "spaceship",
            "action": "towed",
            "object": "boat"
          },
          {
            "subject": "truck",
            "action": "whistled at",
            "object": "spaceship"
          }
        ],
        "middle_entity": "motorcycle",
        "all_entities": [
          "airplane",
          "ambulance",
          "train",
          "boat",
          "truck",
          "motorcycle",
          "spaceship"
        ],
        "questions_by_entity": {
          "airplane": [
            {
              "question": "What did the airplane do?",
              "answer": "wheelie at the ambulance",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What moored to the airplane?",
              "answer": "the motorcycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was moored do?",
              "answer": "wheelied at the ambulance",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the airplane's action?",
              "answer": "the truck whistling at the spaceship which led to the spaceship towing the boat which led to the boat orbiting the motorcycle which led to the motorcycle mooring to the airplane",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the airplane's involvement?",
              "answer": "the ambulance strafed the train",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            }
          ],
          "ambulance": [
            {
              "question": "What did the ambulance do?",
              "answer": "strafe the train",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What wheelied at the ambulance?",
              "answer": "the airplane",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was wheelied at do?",
              "answer": "strafed the train",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the ambulance's action?",
              "answer": "the truck whistling at the spaceship which led to the spaceship towing the boat which led to the boat orbiting the motorcycle which led to the motorcycle mooring to the airplane which led to the airplane doing a wheelie at the ambulance",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the ambulance's involvement?",
              "answer": "the train blared the siren",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": false
            }
          ],
          "train": [
            {
              "question": "What did the train do?",
              "answer": "blared the siren",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What strafed the train?",
              "answer": "the ambulance",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was strafed do?",
              "answer": "blared the siren",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the train's action?",
              "answer": "the truck whistling at the spaceship which led to the spaceship towing the boat which led to the boat orbiting the motorcycle which led to the motorcycle mooring to the airplane which led to the airplane doing a wheelie at the ambulance which led to the ambulance strafing the train",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the train's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            }
          ],
          "boat": [
            {
              "question": "What did the boat do?",
              "answer": "orbit the motorcycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What towed the boat?",
              "answer": "the spaceship",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was towed do?",
              "answer": "orbited the motorcycle",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the boat's action?",
              "answer": "the truck whistling at the spaceship which led to the spaceship towing the boat",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the boat's involvement?",
              "answer": "the motorcycle moored to the airplane",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            }
          ],
          "truck": [
            {
              "question": "What did the truck do?",
              "answer": "whistle at the spaceship",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the truck?",
              "answer": "the spaceship",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the truck do?",
              "answer": "towed the boat",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the truck's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the truck's involvement?",
              "answer": "the spaceship towed the boat",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            }
          ],
          "motorcycle": [
            {
              "question": "What did the motorcycle do?",
              "answer": "moor to the airplane",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "What orbited the motorcycle?",
              "answer": "the boat",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was orbited do?",
              "answer": "moored to the airplane",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the motorcycle's action?",
              "answer": "the truck whistling at the spaceship which led to the spaceship towing the boat which led to the boat orbiting the motorcycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the motorcycle's involvement?",
              "answer": "the airplane wheelied at the ambulance",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": true
            }
          ],
          "spaceship": [
            {
              "question": "What did the spaceship do?",
              "answer": "tow the boat",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What whistled at the spaceship?",
              "answer": "the truck",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was whistled at do?",
              "answer": "towed the boat",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the spaceship's action?",
              "answer": "the truck whistling at the spaceship",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the spaceship's involvement?",
              "answer": "the boat orbited the motorcycle",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 42
      },
      {
        "id": "complexity_6_sentence_18",
        "sentence": "The giraffe that the donkey that the dolphin that the coyote that the deer that the beaver that the horse stretched toward whinnied at gnawed at bounded toward howled at clicked at brayed.",
        "structure": [
          {
            "subject": "giraffe",
            "action": "brayed",
            "object": null
          },
          {
            "subject": "donkey",
            "action": "clicked at",
            "object": "giraffe"
          },
          {
            "subject": "dolphin",
            "action": "howled at",
            "object": "donkey"
          },
          {
            "subject": "coyote",
            "action": "bounded toward",
            "object": "dolphin"
          },
          {
            "subject": "deer",
            "action": "gnawed at",
            "object": "coyote"
          },
          {
            "subject": "beaver",
            "action": "whinnied at",
            "object": "deer"
          },
          {
            "subject": "horse",
            "action": "stretched toward",
            "object": "beaver"
          }
        ],
        "middle_entity": "coyote",
        "all_entities": [
          "deer",
          "coyote",
          "donkey",
          "beaver",
          "dolphin",
          "horse",
          "giraffe"
        ],
        "questions_by_entity": {
          "deer": [
            {
              "question": "What did the deer do?",
              "answer": "gnaw at the coyote",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "deer",
              "is_middle_entity": false
            },
            {
              "question": "What whinnied at the deer?",
              "answer": "the beaver",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "deer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "deer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was whinnied at do?",
              "answer": "gnawed at the coyote",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "deer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the deer's action?",
              "answer": "the horse stretching toward the beaver which led to the beaver whinnying at the deer",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "deer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the deer's involvement?",
              "answer": "the coyote bounded toward the dolphin",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "deer",
              "is_middle_entity": false
            }
          ],
          "coyote": [
            {
              "question": "What did the coyote do?",
              "answer": "bound toward the dolphin",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "coyote",
              "is_middle_entity": true
            },
            {
              "question": "What gnawed at the coyote?",
              "answer": "the deer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "coyote",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "coyote",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was gnawed at do?",
              "answer": "bounded toward the dolphin",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "coyote",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the coyote's action?",
              "answer": "the horse stretching toward the beaver which led to the beaver whinnying at the deer which led to the deer gnawing at the coyote",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "coyote",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the coyote's involvement?",
              "answer": "the dolphin howled at the donkey",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "coyote",
              "is_middle_entity": true
            }
          ],
          "donkey": [
            {
              "question": "What did the donkey do?",
              "answer": "click at the giraffe",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "donkey",
              "is_middle_entity": false
            },
            {
              "question": "What howled at the donkey?",
              "answer": "the dolphin",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "donkey",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "donkey",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was howled at do?",
              "answer": "clicked at the giraffe",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "donkey",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the donkey's action?",
              "answer": "the horse stretching toward the beaver which led to the beaver whinnying at the deer which led to the deer gnawing at the coyote which led to the coyote bounding toward the dolphin which led to the dolphin howling at the donkey",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "donkey",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the donkey's involvement?",
              "answer": "the giraffe brayed",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "donkey",
              "is_middle_entity": false
            }
          ],
          "beaver": [
            {
              "question": "What did the beaver do?",
              "answer": "whinny at the deer",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "beaver",
              "is_middle_entity": false
            },
            {
              "question": "What stretched toward the beaver?",
              "answer": "the horse",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "beaver",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "beaver",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was stretched toward do?",
              "answer": "whinnied at the deer",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "beaver",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the beaver's action?",
              "answer": "the horse stretching toward the beaver",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "beaver",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the beaver's involvement?",
              "answer": "the deer gnawed at the coyote",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "beaver",
              "is_middle_entity": false
            }
          ],
          "dolphin": [
            {
              "question": "What did the dolphin do?",
              "answer": "howl at the donkey",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "dolphin",
              "is_middle_entity": false
            },
            {
              "question": "What bounded toward the dolphin?",
              "answer": "the coyote",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "dolphin",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "dolphin",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was bounded toward do?",
              "answer": "howled at the donkey",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "dolphin",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the dolphin's action?",
              "answer": "the horse stretching toward the beaver which led to the beaver whinnying at the deer which led to the deer gnawing at the coyote which led to the coyote bounding toward the dolphin",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "dolphin",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the dolphin's involvement?",
              "answer": "the donkey clicked at the giraffe",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "dolphin",
              "is_middle_entity": false
            }
          ],
          "horse": [
            {
              "question": "What did the horse do?",
              "answer": "stretch toward the beaver",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "horse",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the horse?",
              "answer": "the beaver",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "horse",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "horse",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the horse do?",
              "answer": "whinnied at the deer",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "horse",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the horse's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "horse",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the horse's involvement?",
              "answer": "the beaver whinnied at the deer",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "horse",
              "is_middle_entity": false
            }
          ],
          "giraffe": [
            {
              "question": "What did the giraffe do?",
              "answer": "bray",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "giraffe",
              "is_middle_entity": false
            },
            {
              "question": "What clicked at the giraffe?",
              "answer": "the donkey",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "giraffe",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "giraffe",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was clicked at do?",
              "answer": "brayed",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "giraffe",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the giraffe's action?",
              "answer": "the horse stretching toward the beaver which led to the beaver whinnying at the deer which led to the deer gnawing at the coyote which led to the coyote bounding toward the dolphin which led to the dolphin howling at the donkey which led to the donkey clicking at the giraffe",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "giraffe",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the giraffe's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "giraffe",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 42
      },
      {
        "id": "complexity_6_sentence_19",
        "sentence": "The truck that the spaceship that the ambulance that the bicycle that the airplane that the boat that the motorcycle towed lane-split past anchored near strafed rang the bell at blared the siren at launched.",
        "structure": [
          {
            "subject": "truck",
            "action": "launched",
            "object": null
          },
          {
            "subject": "spaceship",
            "action": "blared the siren at",
            "object": "truck"
          },
          {
            "subject": "ambulance",
            "action": "rang the bell at",
            "object": "spaceship"
          },
          {
            "subject": "bicycle",
            "action": "strafed",
            "object": "ambulance"
          },
          {
            "subject": "airplane",
            "action": "anchored near",
            "object": "bicycle"
          },
          {
            "subject": "boat",
            "action": "lane-split past",
            "object": "airplane"
          },
          {
            "subject": "motorcycle",
            "action": "towed",
            "object": "boat"
          }
        ],
        "middle_entity": "bicycle",
        "all_entities": [
          "airplane",
          "ambulance",
          "boat",
          "bicycle",
          "spaceship",
          "truck",
          "motorcycle"
        ],
        "questions_by_entity": {
          "airplane": [
            {
              "question": "What did the airplane do?",
              "answer": "anchor near the bicycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What lane-split past the airplane?",
              "answer": "the boat",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was lane-split past do?",
              "answer": "anchored near the bicycle",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the airplane's action?",
              "answer": "the motorcycle towing the boat which led to the boat lane-splitting past the airplane",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the airplane's involvement?",
              "answer": "the bicycle strafed the ambulance",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            }
          ],
          "ambulance": [
            {
              "question": "What did the ambulance do?",
              "answer": "ring the bell at the spaceship",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What strafed the ambulance?",
              "answer": "the bicycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was strafed do?",
              "answer": "rang the bell at the spaceship",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the ambulance's action?",
              "answer": "the motorcycle towing the boat which led to the boat lane-splitting past the airplane which led to the airplane anchoring near the bicycle which led to the bicycle strafing the ambulance",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the ambulance's involvement?",
              "answer": "the spaceship blared the siren at the truck",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": false
            }
          ],
          "boat": [
            {
              "question": "What did the boat do?",
              "answer": "lane-split past the airplane",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What towed the boat?",
              "answer": "the motorcycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was towed do?",
              "answer": "lane-split past the airplane",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the boat's action?",
              "answer": "the motorcycle towing the boat",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the boat's involvement?",
              "answer": "the airplane anchored near the bicycle",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            }
          ],
          "bicycle": [
            {
              "question": "What did the bicycle do?",
              "answer": "strafe the ambulance",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": true
            },
            {
              "question": "What anchored near the bicycle?",
              "answer": "the airplane",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was anchored near do?",
              "answer": "strafed the ambulance",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the bicycle's action?",
              "answer": "the motorcycle towing the boat which led to the boat lane-splitting past the airplane which led to the airplane anchoring near the bicycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the bicycle's involvement?",
              "answer": "the ambulance rang the bell at the spaceship",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": true
            }
          ],
          "spaceship": [
            {
              "question": "What did the spaceship do?",
              "answer": "blared the siren at the truck",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What rang the bell at the spaceship?",
              "answer": "the ambulance",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was ringed do?",
              "answer": "blared the siren at the truck",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the spaceship's action?",
              "answer": "the motorcycle towing the boat which led to the boat lane-splitting past the airplane which led to the airplane anchoring near the bicycle which led to the bicycle strafing the ambulance which led to the ambulance ringing the bell at the spaceship",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the spaceship's involvement?",
              "answer": "the truck launched",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            }
          ],
          "truck": [
            {
              "question": "What did the truck do?",
              "answer": "launch",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What blared the siren at the truck?",
              "answer": "the spaceship",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was blared the siren at do?",
              "answer": "launched",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the truck's action?",
              "answer": "the motorcycle towing the boat which led to the boat lane-splitting past the airplane which led to the airplane anchoring near the bicycle which led to the bicycle strafing the ambulance which led to the ambulance ringing the bell at the spaceship which led to the spaceship blaring the siren at the truck",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the truck's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            }
          ],
          "motorcycle": [
            {
              "question": "What did the motorcycle do?",
              "answer": "tow the boat",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the motorcycle?",
              "answer": "the boat",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the motorcycle do?",
              "answer": "lane-split past the airplane",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the motorcycle's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the motorcycle's involvement?",
              "answer": "the boat lane-split past the airplane",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 42
      },
      {
        "id": "complexity_6_sentence_20",
        "sentence": "The mouse that the cat that the starfish that the whale that the bat that the rabbit that the sheep squeaked at bleated at thumped at echolocated sang at crawled toward meowed.",
        "structure": [
          {
            "subject": "mouse",
            "action": "meowed",
            "object": null
          },
          {
            "subject": "cat",
            "action": "crawled toward",
            "object": "mouse"
          },
          {
            "subject": "starfish",
            "action": "sang at",
            "object": "cat"
          },
          {
            "subject": "whale",
            "action": "echolocated",
            "object": "starfish"
          },
          {
            "subject": "bat",
            "action": "thumped at",
            "object": "whale"
          },
          {
            "subject": "rabbit",
            "action": "bleated at",
            "object": "bat"
          },
          {
            "subject": "sheep",
            "action": "squeaked at",
            "object": "rabbit"
          }
        ],
        "middle_entity": "whale",
        "all_entities": [
          "bat",
          "cat",
          "starfish",
          "sheep",
          "mouse",
          "rabbit",
          "whale"
        ],
        "questions_by_entity": {
          "bat": [
            {
              "question": "What did the bat do?",
              "answer": "thump at the whale",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "bat",
              "is_middle_entity": false
            },
            {
              "question": "What bleated at the bat?",
              "answer": "the rabbit",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "bat",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "bat",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was bleated at do?",
              "answer": "thumped at the whale",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "bat",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the bat's action?",
              "answer": "the sheep squeaking at the rabbit which led to the rabbit bleating at the bat",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "bat",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the bat's involvement?",
              "answer": "the whale echolocated the starfish",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "bat",
              "is_middle_entity": false
            }
          ],
          "cat": [
            {
              "question": "What did the cat do?",
              "answer": "crawl toward the mouse",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "cat",
              "is_middle_entity": false
            },
            {
              "question": "What sang at the cat?",
              "answer": "the starfish",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "cat",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "cat",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was sang at do?",
              "answer": "crawled toward the mouse",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "cat",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the cat's action?",
              "answer": "the sheep squeaking at the rabbit which led to the rabbit bleating at the bat which led to the bat thumping at the whale which led to the whale echolocating the starfish which led to the starfish singing at the cat",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "cat",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the cat's involvement?",
              "answer": "the mouse meowed",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "cat",
              "is_middle_entity": false
            }
          ],
          "starfish": [
            {
              "question": "What did the starfish do?",
              "answer": "sing at the cat",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "starfish",
              "is_middle_entity": false
            },
            {
              "question": "What echolocated the starfish?",
              "answer": "the whale",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "starfish",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "starfish",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was echolocated do?",
              "answer": "sang at the cat",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "starfish",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the starfish's action?",
              "answer": "the sheep squeaking at the rabbit which led to the rabbit bleating at the bat which led to the bat thumping at the whale which led to the whale echolocating the starfish",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "starfish",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the starfish's involvement?",
              "answer": "the cat crawled toward the mouse",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "starfish",
              "is_middle_entity": false
            }
          ],
          "sheep": [
            {
              "question": "What did the sheep do?",
              "answer": "squeak at the rabbit",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "sheep",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the sheep?",
              "answer": "the rabbit",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "sheep",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "sheep",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the sheep do?",
              "answer": "bleated at the bat",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "sheep",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the sheep's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "sheep",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the sheep's involvement?",
              "answer": "the rabbit bleated at the bat",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "sheep",
              "is_middle_entity": false
            }
          ],
          "mouse": [
            {
              "question": "What did the mouse do?",
              "answer": "meow",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "mouse",
              "is_middle_entity": false
            },
            {
              "question": "What crawled toward the mouse?",
              "answer": "the cat",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "mouse",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "mouse",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was crawled toward do?",
              "answer": "meowed",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "mouse",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the mouse's action?",
              "answer": "the sheep squeaking at the rabbit which led to the rabbit bleating at the bat which led to the bat thumping at the whale which led to the whale echolocating the starfish which led to the starfish singing at the cat which led to the cat crawling toward the mouse",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "mouse",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the mouse's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "mouse",
              "is_middle_entity": false
            }
          ],
          "rabbit": [
            {
              "question": "What did the rabbit do?",
              "answer": "bleat at the bat",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "rabbit",
              "is_middle_entity": false
            },
            {
              "question": "What squeaked at the rabbit?",
              "answer": "the sheep",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "rabbit",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "rabbit",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was squeaked at do?",
              "answer": "bleated at the bat",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "rabbit",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the rabbit's action?",
              "answer": "the sheep squeaking at the rabbit",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "rabbit",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the rabbit's involvement?",
              "answer": "the bat thumped at the whale",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "rabbit",
              "is_middle_entity": false
            }
          ],
          "whale": [
            {
              "question": "What did the whale do?",
              "answer": "echolocate the starfish",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "whale",
              "is_middle_entity": true
            },
            {
              "question": "What thumped at the whale?",
              "answer": "the bat",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "whale",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "whale",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was thumped at do?",
              "answer": "echolocated the starfish",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "whale",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the whale's action?",
              "answer": "the sheep squeaking at the rabbit which led to the rabbit bleating at the bat which led to the bat thumping at the whale",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "whale",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the whale's involvement?",
              "answer": "the starfish sang at the cat",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "whale",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 42
      },
      {
        "id": "complexity_6_sentence_21",
        "sentence": "The train that the ambulance that the motorcycle that the boat that the airplane that the spaceship that the bicycle whistled at cycled around orbited air-dropped on anchored near wheelied at blared the siren.",
        "structure": [
          {
            "subject": "train",
            "action": "blared the siren",
            "object": null
          },
          {
            "subject": "ambulance",
            "action": "wheelied at",
            "object": "train"
          },
          {
            "subject": "motorcycle",
            "action": "anchored near",
            "object": "ambulance"
          },
          {
            "subject": "boat",
            "action": "air-dropped on",
            "object": "motorcycle"
          },
          {
            "subject": "airplane",
            "action": "orbited",
            "object": "boat"
          },
          {
            "subject": "spaceship",
            "action": "cycled around",
            "object": "airplane"
          },
          {
            "subject": "bicycle",
            "action": "whistled at",
            "object": "spaceship"
          }
        ],
        "middle_entity": "boat",
        "all_entities": [
          "airplane",
          "ambulance",
          "train",
          "boat",
          "bicycle",
          "motorcycle",
          "spaceship"
        ],
        "questions_by_entity": {
          "airplane": [
            {
              "question": "What did the airplane do?",
              "answer": "orbit the boat",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What cycled around the airplane?",
              "answer": "the spaceship",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was cycled around do?",
              "answer": "orbited the boat",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the airplane's action?",
              "answer": "the bicycle whistling at the spaceship which led to the spaceship cycling around the airplane",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the airplane's involvement?",
              "answer": "the boat air-dropped on the motorcycle",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            }
          ],
          "ambulance": [
            {
              "question": "What did the ambulance do?",
              "answer": "wheelie at the train",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What anchored near the ambulance?",
              "answer": "the motorcycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was anchored near do?",
              "answer": "wheelied at the train",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the ambulance's action?",
              "answer": "the bicycle whistling at the spaceship which led to the spaceship cycling around the airplane which led to the airplane orbiting the boat which led to the boat air-dropping on the motorcycle which led to the motorcycle anchoring near the ambulance",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the ambulance's involvement?",
              "answer": "the train blared the siren",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": false
            }
          ],
          "train": [
            {
              "question": "What did the train do?",
              "answer": "blared the siren",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What wheelied at the train?",
              "answer": "the ambulance",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was wheelied at do?",
              "answer": "blared the siren",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the train's action?",
              "answer": "the bicycle whistling at the spaceship which led to the spaceship cycling around the airplane which led to the airplane orbiting the boat which led to the boat air-dropping on the motorcycle which led to the motorcycle anchoring near the ambulance which led to the ambulance doing a wheelie at the train",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the train's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            }
          ],
          "boat": [
            {
              "question": "What did the boat do?",
              "answer": "air-drop on the motorcycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": true
            },
            {
              "question": "What orbited the boat?",
              "answer": "the airplane",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was orbited do?",
              "answer": "air-dropped on the motorcycle",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the boat's action?",
              "answer": "the bicycle whistling at the spaceship which led to the spaceship cycling around the airplane which led to the airplane orbiting the boat",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the boat's involvement?",
              "answer": "the motorcycle anchored near the ambulance",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": true
            }
          ],
          "bicycle": [
            {
              "question": "What did the bicycle do?",
              "answer": "whistle at the spaceship",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the bicycle?",
              "answer": "the spaceship",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the bicycle do?",
              "answer": "cycled around the airplane",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the bicycle's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the bicycle's involvement?",
              "answer": "the spaceship cycled around the airplane",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": false
            }
          ],
          "motorcycle": [
            {
              "question": "What did the motorcycle do?",
              "answer": "anchor near the ambulance",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What air-dropped on the motorcycle?",
              "answer": "the boat",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was air-dropped on do?",
              "answer": "anchored near the ambulance",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the motorcycle's action?",
              "answer": "the bicycle whistling at the spaceship which led to the spaceship cycling around the airplane which led to the airplane orbiting the boat which led to the boat air-dropping on the motorcycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the motorcycle's involvement?",
              "answer": "the ambulance wheelied at the train",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": false
            }
          ],
          "spaceship": [
            {
              "question": "What did the spaceship do?",
              "answer": "cycle around the airplane",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What whistled at the spaceship?",
              "answer": "the bicycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was whistled at do?",
              "answer": "cycled around the airplane",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the spaceship's action?",
              "answer": "the bicycle whistling at the spaceship",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the spaceship's involvement?",
              "answer": "the airplane orbited the boat",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 42
      },
      {
        "id": "complexity_6_sentence_22",
        "sentence": "The spaceship that the truck that the boat that the ambulance that the motorcycle that the train that the airplane orbited air-dropped on whistled at lane-split past blared the siren at moored to jackknifed.",
        "structure": [
          {
            "subject": "spaceship",
            "action": "jackknifed",
            "object": null
          },
          {
            "subject": "truck",
            "action": "moored to",
            "object": "spaceship"
          },
          {
            "subject": "boat",
            "action": "blared the siren at",
            "object": "truck"
          },
          {
            "subject": "ambulance",
            "action": "lane-split past",
            "object": "boat"
          },
          {
            "subject": "motorcycle",
            "action": "whistled at",
            "object": "ambulance"
          },
          {
            "subject": "train",
            "action": "air-dropped on",
            "object": "motorcycle"
          },
          {
            "subject": "airplane",
            "action": "orbited",
            "object": "train"
          }
        ],
        "middle_entity": "ambulance",
        "all_entities": [
          "airplane",
          "ambulance",
          "train",
          "boat",
          "truck",
          "motorcycle",
          "spaceship"
        ],
        "questions_by_entity": {
          "airplane": [
            {
              "question": "What did the airplane do?",
              "answer": "orbit the train",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the airplane?",
              "answer": "the train",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the airplane do?",
              "answer": "air-dropped on the motorcycle",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the airplane's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the airplane's involvement?",
              "answer": "the train air-dropped on the motorcycle",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            }
          ],
          "ambulance": [
            {
              "question": "What did the ambulance do?",
              "answer": "lane-split past the boat",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": true
            },
            {
              "question": "What whistled at the ambulance?",
              "answer": "the motorcycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was whistled at do?",
              "answer": "lane-split past the boat",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the ambulance's action?",
              "answer": "the airplane orbiting the train which led to the train air-dropping on the motorcycle which led to the motorcycle whistling at the ambulance",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the ambulance's involvement?",
              "answer": "the boat blared the siren at the truck",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": true
            }
          ],
          "train": [
            {
              "question": "What did the train do?",
              "answer": "air-drop on the motorcycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What orbited the train?",
              "answer": "the airplane",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was orbited do?",
              "answer": "air-dropped on the motorcycle",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the train's action?",
              "answer": "the airplane orbiting the train",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the train's involvement?",
              "answer": "the motorcycle whistled at the ambulance",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            }
          ],
          "boat": [
            {
              "question": "What did the boat do?",
              "answer": "blared the siren at the truck",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What lane-split past the boat?",
              "answer": "the ambulance",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was lane-split past do?",
              "answer": "blared the siren at the truck",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the boat's action?",
              "answer": "the airplane orbiting the train which led to the train air-dropping on the motorcycle which led to the motorcycle whistling at the ambulance which led to the ambulance lane-splitting past the boat",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the boat's involvement?",
              "answer": "the truck moored to the spaceship",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            }
          ],
          "truck": [
            {
              "question": "What did the truck do?",
              "answer": "moor to the spaceship",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What blared the siren at the truck?",
              "answer": "the boat",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was blared the siren at do?",
              "answer": "moored to the spaceship",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the truck's action?",
              "answer": "the airplane orbiting the train which led to the train air-dropping on the motorcycle which led to the motorcycle whistling at the ambulance which led to the ambulance lane-splitting past the boat which led to the boat blaring the siren at the truck",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the truck's involvement?",
              "answer": "the spaceship jackknifed",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            }
          ],
          "motorcycle": [
            {
              "question": "What did the motorcycle do?",
              "answer": "whistle at the ambulance",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What air-dropped on the motorcycle?",
              "answer": "the train",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was air-dropped on do?",
              "answer": "whistled at the ambulance",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the motorcycle's action?",
              "answer": "the airplane orbiting the train which led to the train air-dropping on the motorcycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the motorcycle's involvement?",
              "answer": "the ambulance lane-split past the boat",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": false
            }
          ],
          "spaceship": [
            {
              "question": "What did the spaceship do?",
              "answer": "jackknife",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What moored to the spaceship?",
              "answer": "the truck",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was moored do?",
              "answer": "jackknifed",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the spaceship's action?",
              "answer": "the airplane orbiting the train which led to the train air-dropping on the motorcycle which led to the motorcycle whistling at the ambulance which led to the ambulance lane-splitting past the boat which led to the boat blaring the siren at the truck which led to the truck mooring to the spaceship",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the spaceship's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 42
      },
      {
        "id": "complexity_6_sentence_23",
        "sentence": "The skunk that the coyote that the camel that the frog that the cockroach that the squirrel that the rabbit sprayed at thumped at chittered at scuttled toward croaked at spat at howled.",
        "structure": [
          {
            "subject": "skunk",
            "action": "howled",
            "object": null
          },
          {
            "subject": "coyote",
            "action": "spat at",
            "object": "skunk"
          },
          {
            "subject": "camel",
            "action": "croaked at",
            "object": "coyote"
          },
          {
            "subject": "frog",
            "action": "scuttled toward",
            "object": "camel"
          },
          {
            "subject": "cockroach",
            "action": "chittered at",
            "object": "frog"
          },
          {
            "subject": "squirrel",
            "action": "thumped at",
            "object": "cockroach"
          },
          {
            "subject": "rabbit",
            "action": "sprayed at",
            "object": "squirrel"
          }
        ],
        "middle_entity": "frog",
        "all_entities": [
          "squirrel",
          "cockroach",
          "camel",
          "coyote",
          "skunk",
          "rabbit",
          "frog"
        ],
        "questions_by_entity": {
          "squirrel": [
            {
              "question": "What did the squirrel do?",
              "answer": "thump at the cockroach",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "squirrel",
              "is_middle_entity": false
            },
            {
              "question": "What sprayed at the squirrel?",
              "answer": "the rabbit",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "squirrel",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "squirrel",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was sprayed at do?",
              "answer": "thumped at the cockroach",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "squirrel",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the squirrel's action?",
              "answer": "the rabbit spraying at the squirrel",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "squirrel",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the squirrel's involvement?",
              "answer": "the cockroach chittered at the frog",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "squirrel",
              "is_middle_entity": false
            }
          ],
          "cockroach": [
            {
              "question": "What did the cockroach do?",
              "answer": "chitter at the frog",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "cockroach",
              "is_middle_entity": false
            },
            {
              "question": "What thumped at the cockroach?",
              "answer": "the squirrel",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "cockroach",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "cockroach",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was thumped at do?",
              "answer": "chittered at the frog",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "cockroach",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the cockroach's action?",
              "answer": "the rabbit spraying at the squirrel which led to the squirrel thumping at the cockroach",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "cockroach",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the cockroach's involvement?",
              "answer": "the frog scuttled toward the camel",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "cockroach",
              "is_middle_entity": false
            }
          ],
          "camel": [
            {
              "question": "What did the camel do?",
              "answer": "croak at the coyote",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "camel",
              "is_middle_entity": false
            },
            {
              "question": "What scuttled toward the camel?",
              "answer": "the frog",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "camel",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "camel",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was scuttled toward do?",
              "answer": "croaked at the coyote",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "camel",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the camel's action?",
              "answer": "the rabbit spraying at the squirrel which led to the squirrel thumping at the cockroach which led to the cockroach chittering at the frog which led to the frog scuttling toward the camel",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "camel",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the camel's involvement?",
              "answer": "the coyote spat at the skunk",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "camel",
              "is_middle_entity": false
            }
          ],
          "coyote": [
            {
              "question": "What did the coyote do?",
              "answer": "spit at the skunk",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "coyote",
              "is_middle_entity": false
            },
            {
              "question": "What croaked at the coyote?",
              "answer": "the camel",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "coyote",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "coyote",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was croaked at do?",
              "answer": "spat at the skunk",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "coyote",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the coyote's action?",
              "answer": "the rabbit spraying at the squirrel which led to the squirrel thumping at the cockroach which led to the cockroach chittering at the frog which led to the frog scuttling toward the camel which led to the camel croaking at the coyote",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "coyote",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the coyote's involvement?",
              "answer": "the skunk howled",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "coyote",
              "is_middle_entity": false
            }
          ],
          "skunk": [
            {
              "question": "What did the skunk do?",
              "answer": "howl",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "skunk",
              "is_middle_entity": false
            },
            {
              "question": "What spat at the skunk?",
              "answer": "the coyote",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "skunk",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "skunk",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was spat at do?",
              "answer": "howled",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "skunk",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the skunk's action?",
              "answer": "the rabbit spraying at the squirrel which led to the squirrel thumping at the cockroach which led to the cockroach chittering at the frog which led to the frog scuttling toward the camel which led to the camel croaking at the coyote which led to the coyote spitting at the skunk",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "skunk",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the skunk's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "skunk",
              "is_middle_entity": false
            }
          ],
          "rabbit": [
            {
              "question": "What did the rabbit do?",
              "answer": "spray at the squirrel",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "rabbit",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the rabbit?",
              "answer": "the squirrel",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "rabbit",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "rabbit",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the rabbit do?",
              "answer": "thumped at the cockroach",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "rabbit",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the rabbit's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "rabbit",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the rabbit's involvement?",
              "answer": "the squirrel thumped at the cockroach",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "rabbit",
              "is_middle_entity": false
            }
          ],
          "frog": [
            {
              "question": "What did the frog do?",
              "answer": "scuttle toward the camel",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "frog",
              "is_middle_entity": true
            },
            {
              "question": "What chittered at the frog?",
              "answer": "the cockroach",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "frog",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "frog",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was chittered at do?",
              "answer": "scuttled toward the camel",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "frog",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the frog's action?",
              "answer": "the rabbit spraying at the squirrel which led to the squirrel thumping at the cockroach which led to the cockroach chittering at the frog",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "frog",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the frog's involvement?",
              "answer": "the camel croaked at the coyote",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "frog",
              "is_middle_entity": true
            }
          ]
        },
        "total_questions": 42
      },
      {
        "id": "complexity_6_sentence_24",
        "sentence": "The dog that the horse that the elephant that the mouse that the bat that the crab that the heron barked at speared scuttled toward echolocated scurried toward trumpeted at galloped.",
        "structure": [
          {
            "subject": "dog",
            "action": "galloped",
            "object": null
          },
          {
            "subject": "horse",
            "action": "trumpeted at",
            "object": "dog"
          },
          {
            "subject": "elephant",
            "action": "scurried toward",
            "object": "horse"
          },
          {
            "subject": "mouse",
            "action": "echolocated",
            "object": "elephant"
          },
          {
            "subject": "bat",
            "action": "scuttled toward",
            "object": "mouse"
          },
          {
            "subject": "crab",
            "action": "speared",
            "object": "bat"
          },
          {
            "subject": "heron",
            "action": "barked at",
            "object": "crab"
          }
        ],
        "middle_entity": "mouse",
        "all_entities": [
          "bat",
          "heron",
          "dog",
          "elephant",
          "crab",
          "mouse",
          "horse"
        ],
        "questions_by_entity": {
          "bat": [
            {
              "question": "What did the bat do?",
              "answer": "scuttle toward the mouse",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "bat",
              "is_middle_entity": false
            },
            {
              "question": "What speared the bat?",
              "answer": "the crab",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "bat",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "bat",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was speared do?",
              "answer": "scuttled toward the mouse",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "bat",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the bat's action?",
              "answer": "the heron barking at the crab which led to the crab spearing the bat",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "bat",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the bat's involvement?",
              "answer": "the mouse echolocated the elephant",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "bat",
              "is_middle_entity": false
            }
          ],
          "heron": [
            {
              "question": "What did the heron do?",
              "answer": "bark at the crab",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "heron",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the heron?",
              "answer": "the crab",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "heron",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "heron",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the heron do?",
              "answer": "speared the bat",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "heron",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the heron's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "heron",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the heron's involvement?",
              "answer": "the crab speared the bat",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "heron",
              "is_middle_entity": false
            }
          ],
          "dog": [
            {
              "question": "What did the dog do?",
              "answer": "gallop",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "dog",
              "is_middle_entity": false
            },
            {
              "question": "What trumpeted at the dog?",
              "answer": "the horse",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "dog",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "dog",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was trumpeted at do?",
              "answer": "galloped",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "dog",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the dog's action?",
              "answer": "the heron barking at the crab which led to the crab spearing the bat which led to the bat scuttling toward the mouse which led to the mouse echolocating the elephant which led to the elephant scurrying toward the horse which led to the horse trumpeting at the dog",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "dog",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the dog's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "dog",
              "is_middle_entity": false
            }
          ],
          "elephant": [
            {
              "question": "What did the elephant do?",
              "answer": "scurry toward the horse",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "elephant",
              "is_middle_entity": false
            },
            {
              "question": "What echolocated the elephant?",
              "answer": "the mouse",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "elephant",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "elephant",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was echolocated do?",
              "answer": "scurried toward the horse",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "elephant",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the elephant's action?",
              "answer": "the heron barking at the crab which led to the crab spearing the bat which led to the bat scuttling toward the mouse which led to the mouse echolocating the elephant",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "elephant",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the elephant's involvement?",
              "answer": "the horse trumpeted at the dog",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "elephant",
              "is_middle_entity": false
            }
          ],
          "crab": [
            {
              "question": "What did the crab do?",
              "answer": "spear the bat",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "crab",
              "is_middle_entity": false
            },
            {
              "question": "What barked at the crab?",
              "answer": "the heron",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "crab",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "crab",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was barked at do?",
              "answer": "speared the bat",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "crab",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the crab's action?",
              "answer": "the heron barking at the crab",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "crab",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the crab's involvement?",
              "answer": "the bat scuttled toward the mouse",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "crab",
              "is_middle_entity": false
            }
          ],
          "mouse": [
            {
              "question": "What did the mouse do?",
              "answer": "echolocate the elephant",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "mouse",
              "is_middle_entity": true
            },
            {
              "question": "What scuttled toward the mouse?",
              "answer": "the bat",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "mouse",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "mouse",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was scuttled toward do?",
              "answer": "echolocated the elephant",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "mouse",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the mouse's action?",
              "answer": "the heron barking at the crab which led to the crab spearing the bat which led to the bat scuttling toward the mouse",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "mouse",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the mouse's involvement?",
              "answer": "the elephant scurried toward the horse",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "mouse",
              "is_middle_entity": true
            }
          ],
          "horse": [
            {
              "question": "What did the horse do?",
              "answer": "trumpet at the dog",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "horse",
              "is_middle_entity": false
            },
            {
              "question": "What scurried toward the horse?",
              "answer": "the elephant",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "horse",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "horse",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was scurried toward do?",
              "answer": "trumpeted at the dog",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "horse",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the horse's action?",
              "answer": "the heron barking at the crab which led to the crab spearing the bat which led to the bat scuttling toward the mouse which led to the mouse echolocating the elephant which led to the elephant scurrying toward the horse",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "horse",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the horse's involvement?",
              "answer": "the dog galloped",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "horse",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 42
      },
      {
        "id": "complexity_6_sentence_25",
        "sentence": "The police officer that the photographer that the firefighter that the surgeon that the judge that the principal that the doctor arrested prescribed medicine to disciplined ruled against incised carried out photographed.",
        "structure": [
          {
            "subject": "police officer",
            "action": "photographed",
            "object": null
          },
          {
            "subject": "photographer",
            "action": "carried out",
            "object": "police officer"
          },
          {
            "subject": "firefighter",
            "action": "incised",
            "object": "photographer"
          },
          {
            "subject": "surgeon",
            "action": "ruled against",
            "object": "firefighter"
          },
          {
            "subject": "judge",
            "action": "disciplined",
            "object": "surgeon"
          },
          {
            "subject": "principal",
            "action": "prescribed medicine to",
            "object": "judge"
          },
          {
            "subject": "doctor",
            "action": "arrested",
            "object": "principal"
          }
        ],
        "middle_entity": "surgeon",
        "all_entities": [
          "principal",
          "doctor",
          "police officer",
          "judge",
          "surgeon",
          "photographer",
          "firefighter"
        ],
        "questions_by_entity": {
          "principal": [
            {
              "question": "What did the principal do?",
              "answer": "prescribe medicine to the judge",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "Who arrested the principal?",
              "answer": "the doctor",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was arrested do?",
              "answer": "prescribed medicine to the judge",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the principal's action?",
              "answer": "the doctor arresting the principal",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the principal's involvement?",
              "answer": "the judge disciplined the surgeon",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "principal",
              "is_middle_entity": false
            }
          ],
          "doctor": [
            {
              "question": "What did the doctor do?",
              "answer": "arrest the principal",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "doctor",
              "is_middle_entity": false
            },
            {
              "question": "Who was affected by the doctor?",
              "answer": "the principal",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "doctor",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "doctor",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the doctor do?",
              "answer": "prescribed medicine to the judge",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "doctor",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the doctor's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "doctor",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the doctor's involvement?",
              "answer": "the principal prescribed medicine to the judge",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "doctor",
              "is_middle_entity": false
            }
          ],
          "police officer": [
            {
              "question": "What did the police officer do?",
              "answer": "photograph",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "Who carried out the police officer?",
              "answer": "the photographer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was carried out do?",
              "answer": "photographed",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the police officer's action?",
              "answer": "the doctor arresting the principal which led to the principal prescribing medicine to the judge which led to the judge disciplining the surgeon which led to the surgeon ruling against the firefighter which led to the firefighter incising the photographer which led to the photographer carrying out the police officer",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "police officer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the police officer's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "police officer",
              "is_middle_entity": false
            }
          ],
          "judge": [
            {
              "question": "What did the judge do?",
              "answer": "discipline the surgeon",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "Who prescribed medicine to the judge?",
              "answer": "the principal",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was prescribed medicine do?",
              "answer": "disciplined the surgeon",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the judge's action?",
              "answer": "the doctor arresting the principal which led to the principal prescribing medicine to the judge",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "judge",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the judge's involvement?",
              "answer": "the surgeon ruled against the firefighter",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "judge",
              "is_middle_entity": false
            }
          ],
          "surgeon": [
            {
              "question": "What did the surgeon do?",
              "answer": "rule against the firefighter",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "surgeon",
              "is_middle_entity": true
            },
            {
              "question": "Who disciplined the surgeon?",
              "answer": "the judge",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "surgeon",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "surgeon",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was disciplined do?",
              "answer": "ruled against the firefighter",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "surgeon",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the surgeon's action?",
              "answer": "the doctor arresting the principal which led to the principal prescribing medicine to the judge which led to the judge disciplining the surgeon",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "surgeon",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the surgeon's involvement?",
              "answer": "the firefighter incised the photographer",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "surgeon",
              "is_middle_entity": true
            }
          ],
          "photographer": [
            {
              "question": "What did the photographer do?",
              "answer": "carry out the police officer",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "Who incised the photographer?",
              "answer": "the firefighter",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was incised do?",
              "answer": "carried out the police officer",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the photographer's action?",
              "answer": "the doctor arresting the principal which led to the principal prescribing medicine to the judge which led to the judge disciplining the surgeon which led to the surgeon ruling against the firefighter which led to the firefighter incising the photographer",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the photographer's involvement?",
              "answer": "the police officer photographed",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "photographer",
              "is_middle_entity": false
            }
          ],
          "firefighter": [
            {
              "question": "What did the firefighter do?",
              "answer": "incise the photographer",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "Who ruled against the firefighter?",
              "answer": "the surgeon",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was ruled against do?",
              "answer": "incised the photographer",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the firefighter's action?",
              "answer": "the doctor arresting the principal which led to the principal prescribing medicine to the judge which led to the judge disciplining the surgeon which led to the surgeon ruling against the firefighter",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the firefighter's involvement?",
              "answer": "the photographer carried out the police officer",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "firefighter",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 42
      },
      {
        "id": "complexity_6_sentence_26",
        "sentence": "The doctor that the principal that the surgeon that the waiter that the firefighter that the photographer that the lawyer prescribed medicine to defended in court photographed carried out seated operated on called an assembly.",
        "structure": [
          {
            "subject": "doctor",
            "action": "called an assembly",
            "object": null
          },
          {
            "subject": "principal",
            "action": "operated on",
            "object": "doctor"
          },
          {
            "subject": "surgeon",
            "action": "seated",
            "object": "principal"
          },
          {
            "subject": "waiter",
            "action": "carried out",
            "object": "surgeon"
          },
          {
            "subject": "firefighter",
            "action": "photographed",
            "object": "waiter"
          },
          {
            "subject": "photographer",
            "action": "defended in court",
            "object": "firefighter"
          },
          {
            "subject": "lawyer",
            "action": "prescribed medicine to",
            "object": "photographer"
          }
        ],
        "middle_entity": "waiter",
        "all_entities": [
          "principal",
          "doctor",
          "lawyer",
          "waiter",
          "surgeon",
          "photographer",
          "firefighter"
        ],
        "questions_by_entity": {
          "principal": [
            {
              "question": "What did the principal do?",
              "answer": "operate on the doctor",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "Who seated the principal?",
              "answer": "the surgeon",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was seated do?",
              "answer": "operated on the doctor",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the principal's action?",
              "answer": "the lawyer prescribing medicine to the photographer which led to the photographer defending in court the firefighter which led to the firefighter photographing the waiter which led to the waiter carrying out the surgeon which led to the surgeon seating the principal",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the principal's involvement?",
              "answer": "the doctor called an assembly",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "principal",
              "is_middle_entity": false
            }
          ],
          "doctor": [
            {
              "question": "What did the doctor do?",
              "answer": "call an assembly",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "doctor",
              "is_middle_entity": false
            },
            {
              "question": "Who operated on the doctor?",
              "answer": "the principal",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "doctor",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "doctor",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was operated on do?",
              "answer": "called an assembly",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "doctor",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the doctor's action?",
              "answer": "the lawyer prescribing medicine to the photographer which led to the photographer defending in court the firefighter which led to the firefighter photographing the waiter which led to the waiter carrying out the surgeon which led to the surgeon seating the principal which led to the principal operating on the doctor",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "doctor",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the doctor's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "doctor",
              "is_middle_entity": false
            }
          ],
          "lawyer": [
            {
              "question": "What did the lawyer do?",
              "answer": "prescribe medicine to the photographer",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "Who was affected by the lawyer?",
              "answer": "the photographer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the lawyer do?",
              "answer": "defended in court the firefighter",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the lawyer's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the lawyer's involvement?",
              "answer": "the photographer defended in court the firefighter",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "lawyer",
              "is_middle_entity": false
            }
          ],
          "waiter": [
            {
              "question": "What did the waiter do?",
              "answer": "carry out the surgeon",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "waiter",
              "is_middle_entity": true
            },
            {
              "question": "Who photographed the waiter?",
              "answer": "the firefighter",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "waiter",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "waiter",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was photographed do?",
              "answer": "carried out the surgeon",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "waiter",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the waiter's action?",
              "answer": "the lawyer prescribing medicine to the photographer which led to the photographer defending in court the firefighter which led to the firefighter photographing the waiter",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "waiter",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the waiter's involvement?",
              "answer": "the surgeon seated the principal",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "waiter",
              "is_middle_entity": true
            }
          ],
          "surgeon": [
            {
              "question": "What did the surgeon do?",
              "answer": "seat the principal",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "Who carried out the surgeon?",
              "answer": "the waiter",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was carried out do?",
              "answer": "seated the principal",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the surgeon's action?",
              "answer": "the lawyer prescribing medicine to the photographer which led to the photographer defending in court the firefighter which led to the firefighter photographing the waiter which led to the waiter carrying out the surgeon",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the surgeon's involvement?",
              "answer": "the principal operated on the doctor",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "surgeon",
              "is_middle_entity": false
            }
          ],
          "photographer": [
            {
              "question": "What did the photographer do?",
              "answer": "defend in court the firefighter",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "Who prescribed medicine to the photographer?",
              "answer": "the lawyer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was prescribed medicine do?",
              "answer": "defended in court the firefighter",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the photographer's action?",
              "answer": "the lawyer prescribing medicine to the photographer",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "photographer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the photographer's involvement?",
              "answer": "the firefighter photographed the waiter",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "photographer",
              "is_middle_entity": false
            }
          ],
          "firefighter": [
            {
              "question": "What did the firefighter do?",
              "answer": "photograph the waiter",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "Who defended in court the firefighter?",
              "answer": "the photographer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was defended in court do?",
              "answer": "photographed the waiter",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the firefighter's action?",
              "answer": "the lawyer prescribing medicine to the photographer which led to the photographer defending in court the firefighter",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the firefighter's involvement?",
              "answer": "the waiter carried out the surgeon",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "firefighter",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 42
      },
      {
        "id": "complexity_6_sentence_27",
        "sentence": "The ambulance that the train that the bicycle that the airplane that the motorcycle that the spaceship that the boat blared the siren at moored to orbited wheelied at strafed pedaled past steamed.",
        "structure": [
          {
            "subject": "ambulance",
            "action": "steamed",
            "object": null
          },
          {
            "subject": "train",
            "action": "pedaled past",
            "object": "ambulance"
          },
          {
            "subject": "bicycle",
            "action": "strafed",
            "object": "train"
          },
          {
            "subject": "airplane",
            "action": "wheelied at",
            "object": "bicycle"
          },
          {
            "subject": "motorcycle",
            "action": "orbited",
            "object": "airplane"
          },
          {
            "subject": "spaceship",
            "action": "moored to",
            "object": "motorcycle"
          },
          {
            "subject": "boat",
            "action": "blared the siren at",
            "object": "spaceship"
          }
        ],
        "middle_entity": "airplane",
        "all_entities": [
          "airplane",
          "ambulance",
          "train",
          "boat",
          "bicycle",
          "motorcycle",
          "spaceship"
        ],
        "questions_by_entity": {
          "airplane": [
            {
              "question": "What did the airplane do?",
              "answer": "wheelie at the bicycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": true
            },
            {
              "question": "What orbited the airplane?",
              "answer": "the motorcycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was orbited do?",
              "answer": "wheelied at the bicycle",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the airplane's action?",
              "answer": "the boat blaring the siren at the spaceship which led to the spaceship mooring to the motorcycle which led to the motorcycle orbiting the airplane",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the airplane's involvement?",
              "answer": "the bicycle strafed the train",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": true
            }
          ],
          "ambulance": [
            {
              "question": "What did the ambulance do?",
              "answer": "steam",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What pedaled past the ambulance?",
              "answer": "the train",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was pedaled past do?",
              "answer": "steamed",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the ambulance's action?",
              "answer": "the boat blaring the siren at the spaceship which led to the spaceship mooring to the motorcycle which led to the motorcycle orbiting the airplane which led to the airplane doing a wheelie at the bicycle which led to the bicycle strafing the train which led to the train pedaling past the ambulance",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the ambulance's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": false
            }
          ],
          "train": [
            {
              "question": "What did the train do?",
              "answer": "pedal past the ambulance",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What strafed the train?",
              "answer": "the bicycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was strafed do?",
              "answer": "pedaled past the ambulance",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the train's action?",
              "answer": "the boat blaring the siren at the spaceship which led to the spaceship mooring to the motorcycle which led to the motorcycle orbiting the airplane which led to the airplane doing a wheelie at the bicycle which led to the bicycle strafing the train",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the train's involvement?",
              "answer": "the ambulance steamed",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            }
          ],
          "boat": [
            {
              "question": "What did the boat do?",
              "answer": "blared the siren at the spaceship",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the boat?",
              "answer": "the spaceship",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the boat do?",
              "answer": "moored to the motorcycle",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the boat's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the boat's involvement?",
              "answer": "the spaceship moored to the motorcycle",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            }
          ],
          "bicycle": [
            {
              "question": "What did the bicycle do?",
              "answer": "strafe the train",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What wheelied at the bicycle?",
              "answer": "the airplane",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was wheelied at do?",
              "answer": "strafed the train",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the bicycle's action?",
              "answer": "the boat blaring the siren at the spaceship which led to the spaceship mooring to the motorcycle which led to the motorcycle orbiting the airplane which led to the airplane doing a wheelie at the bicycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the bicycle's involvement?",
              "answer": "the train pedaled past the ambulance",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": false
            }
          ],
          "motorcycle": [
            {
              "question": "What did the motorcycle do?",
              "answer": "orbit the airplane",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What moored to the motorcycle?",
              "answer": "the spaceship",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was moored do?",
              "answer": "orbited the airplane",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the motorcycle's action?",
              "answer": "the boat blaring the siren at the spaceship which led to the spaceship mooring to the motorcycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the motorcycle's involvement?",
              "answer": "the airplane wheelied at the bicycle",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": false
            }
          ],
          "spaceship": [
            {
              "question": "What did the spaceship do?",
              "answer": "moor to the motorcycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What blared the siren at the spaceship?",
              "answer": "the boat",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was blared the siren at do?",
              "answer": "moored to the motorcycle",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the spaceship's action?",
              "answer": "the boat blaring the siren at the spaceship",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the spaceship's involvement?",
              "answer": "the motorcycle orbited the airplane",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 42
      },
      {
        "id": "complexity_6_sentence_28",
        "sentence": "The motorcycle that the spaceship that the boat that the ambulance that the train that the truck that the airplane lane-split past air-dropped on jackknifed into whistled at blared the siren at moored to blasted off into the sky.",
        "structure": [
          {
            "subject": "motorcycle",
            "action": "blasted off into the sky",
            "object": null
          },
          {
            "subject": "spaceship",
            "action": "moored to",
            "object": "motorcycle"
          },
          {
            "subject": "boat",
            "action": "blared the siren at",
            "object": "spaceship"
          },
          {
            "subject": "ambulance",
            "action": "whistled at",
            "object": "boat"
          },
          {
            "subject": "train",
            "action": "jackknifed into",
            "object": "ambulance"
          },
          {
            "subject": "truck",
            "action": "air-dropped on",
            "object": "train"
          },
          {
            "subject": "airplane",
            "action": "lane-split past",
            "object": "truck"
          }
        ],
        "middle_entity": "ambulance",
        "all_entities": [
          "airplane",
          "ambulance",
          "train",
          "boat",
          "truck",
          "spaceship",
          "motorcycle"
        ],
        "questions_by_entity": {
          "airplane": [
            {
              "question": "What did the airplane do?",
              "answer": "lane-split past the truck",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the airplane?",
              "answer": "the truck",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the airplane do?",
              "answer": "air-dropped on the train",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the airplane's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the airplane's involvement?",
              "answer": "the truck air-dropped on the train",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "airplane",
              "is_middle_entity": false
            }
          ],
          "ambulance": [
            {
              "question": "What did the ambulance do?",
              "answer": "whistle at the boat",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": true
            },
            {
              "question": "What jackknifed into the ambulance?",
              "answer": "the train",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was jackknifed into do?",
              "answer": "whistled at the boat",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the ambulance's action?",
              "answer": "the airplane lane-splitting past the truck which led to the truck air-dropping on the train which led to the train jackknifing into the ambulance",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the ambulance's involvement?",
              "answer": "the boat blared the siren at the spaceship",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": true
            }
          ],
          "train": [
            {
              "question": "What did the train do?",
              "answer": "jackknife into the ambulance",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What air-dropped on the train?",
              "answer": "the truck",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was air-dropped on do?",
              "answer": "jackknifed into the ambulance",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the train's action?",
              "answer": "the airplane lane-splitting past the truck which led to the truck air-dropping on the train",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the train's involvement?",
              "answer": "the ambulance whistled at the boat",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            }
          ],
          "boat": [
            {
              "question": "What did the boat do?",
              "answer": "blared the siren at the spaceship",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What whistled at the boat?",
              "answer": "the ambulance",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was whistled at do?",
              "answer": "blared the siren at the spaceship",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the boat's action?",
              "answer": "the airplane lane-splitting past the truck which led to the truck air-dropping on the train which led to the train jackknifing into the ambulance which led to the ambulance whistling at the boat",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the boat's involvement?",
              "answer": "the spaceship moored to the motorcycle",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            }
          ],
          "truck": [
            {
              "question": "What did the truck do?",
              "answer": "air-drop on the train",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What lane-split past the truck?",
              "answer": "the airplane",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was lane-split past do?",
              "answer": "air-dropped on the train",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the truck's action?",
              "answer": "the airplane lane-splitting past the truck",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the truck's involvement?",
              "answer": "the train jackknifed into the ambulance",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            }
          ],
          "spaceship": [
            {
              "question": "What did the spaceship do?",
              "answer": "moor to the motorcycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What blared the siren at the spaceship?",
              "answer": "the boat",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was blared the siren at do?",
              "answer": "moored to the motorcycle",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the spaceship's action?",
              "answer": "the airplane lane-splitting past the truck which led to the truck air-dropping on the train which led to the train jackknifing into the ambulance which led to the ambulance whistling at the boat which led to the boat blaring the siren at the spaceship",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the spaceship's involvement?",
              "answer": "the motorcycle blasted off into the sky",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            }
          ],
          "motorcycle": [
            {
              "question": "What did the motorcycle do?",
              "answer": "blast off into the sky",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What moored to the motorcycle?",
              "answer": "the spaceship",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was moored do?",
              "answer": "blasted off into the sky",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the motorcycle's action?",
              "answer": "the airplane lane-splitting past the truck which led to the truck air-dropping on the train which led to the train jackknifing into the ambulance which led to the ambulance whistling at the boat which led to the boat blaring the siren at the spaceship which led to the spaceship mooring to the motorcycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the motorcycle's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 42
      },
      {
        "id": "complexity_6_sentence_29",
        "sentence": "The boat that the train that the ambulance that the bicycle that the spaceship that the motorcycle that the truck sailed past towed lane-split past orbited cycled around blared the siren at whistled.",
        "structure": [
          {
            "subject": "boat",
            "action": "whistled",
            "object": null
          },
          {
            "subject": "train",
            "action": "blared the siren at",
            "object": "boat"
          },
          {
            "subject": "ambulance",
            "action": "cycled around",
            "object": "train"
          },
          {
            "subject": "bicycle",
            "action": "orbited",
            "object": "ambulance"
          },
          {
            "subject": "spaceship",
            "action": "lane-split past",
            "object": "bicycle"
          },
          {
            "subject": "motorcycle",
            "action": "towed",
            "object": "spaceship"
          },
          {
            "subject": "truck",
            "action": "sailed past",
            "object": "motorcycle"
          }
        ],
        "middle_entity": "bicycle",
        "all_entities": [
          "ambulance",
          "train",
          "boat",
          "bicycle",
          "truck",
          "spaceship",
          "motorcycle"
        ],
        "questions_by_entity": {
          "ambulance": [
            {
              "question": "What did the ambulance do?",
              "answer": "cycle around the train",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What orbited the ambulance?",
              "answer": "the bicycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was orbited do?",
              "answer": "cycled around the train",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the ambulance's action?",
              "answer": "the truck sailing past the motorcycle which led to the motorcycle towing the spaceship which led to the spaceship lane-splitting past the bicycle which led to the bicycle orbiting the ambulance",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the ambulance's involvement?",
              "answer": "the train blared the siren at the boat",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "ambulance",
              "is_middle_entity": false
            }
          ],
          "train": [
            {
              "question": "What did the train do?",
              "answer": "blared the siren at the boat",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What cycled around the train?",
              "answer": "the ambulance",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was cycled around do?",
              "answer": "blared the siren at the boat",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the train's action?",
              "answer": "the truck sailing past the motorcycle which led to the motorcycle towing the spaceship which led to the spaceship lane-splitting past the bicycle which led to the bicycle orbiting the ambulance which led to the ambulance cycling around the train",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the train's involvement?",
              "answer": "the boat whistled",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "train",
              "is_middle_entity": false
            }
          ],
          "boat": [
            {
              "question": "What did the boat do?",
              "answer": "whistle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What blared the siren at the boat?",
              "answer": "the train",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was blared the siren at do?",
              "answer": "whistled",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the boat's action?",
              "answer": "the truck sailing past the motorcycle which led to the motorcycle towing the spaceship which led to the spaceship lane-splitting past the bicycle which led to the bicycle orbiting the ambulance which led to the ambulance cycling around the train which led to the train blaring the siren at the boat",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the boat's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "boat",
              "is_middle_entity": false
            }
          ],
          "bicycle": [
            {
              "question": "What did the bicycle do?",
              "answer": "orbit the ambulance",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": true
            },
            {
              "question": "What lane-split past the bicycle?",
              "answer": "the spaceship",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "bicycle",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was lane-split past do?",
              "answer": "orbited the ambulance",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "bicycle",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the bicycle's action?",
              "answer": "the truck sailing past the motorcycle which led to the motorcycle towing the spaceship which led to the spaceship lane-splitting past the bicycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the bicycle's involvement?",
              "answer": "the ambulance cycled around the train",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "bicycle",
              "is_middle_entity": true
            }
          ],
          "truck": [
            {
              "question": "What did the truck do?",
              "answer": "sail past the motorcycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What was affected by the truck?",
              "answer": "the motorcycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the truck do?",
              "answer": "towed the spaceship",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the truck's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the truck's involvement?",
              "answer": "the motorcycle towed the spaceship",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "truck",
              "is_middle_entity": false
            }
          ],
          "spaceship": [
            {
              "question": "What did the spaceship do?",
              "answer": "lane-split past the bicycle",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What towed the spaceship?",
              "answer": "the motorcycle",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was towed do?",
              "answer": "lane-split past the bicycle",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the spaceship's action?",
              "answer": "the truck sailing past the motorcycle which led to the motorcycle towing the spaceship",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the spaceship's involvement?",
              "answer": "the bicycle orbited the ambulance",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "spaceship",
              "is_middle_entity": false
            }
          ],
          "motorcycle": [
            {
              "question": "What did the motorcycle do?",
              "answer": "tow the spaceship",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What sailed past the motorcycle?",
              "answer": "the truck",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was sailed past do?",
              "answer": "towed the spaceship",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the motorcycle's action?",
              "answer": "the truck sailing past the motorcycle",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the motorcycle's involvement?",
              "answer": "the spaceship lane-split past the bicycle",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "motorcycle",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 42
      },
      {
        "id": "complexity_6_sentence_30",
        "sentence": "The doctor that the surgeon that the lawyer that the police officer that the waiter that the firefighter that the principal prescribed medicine to disciplined rescued seated handcuffed subpoenaed operated.",
        "structure": [
          {
            "subject": "doctor",
            "action": "operated",
            "object": null
          },
          {
            "subject": "surgeon",
            "action": "subpoenaed",
            "object": "doctor"
          },
          {
            "subject": "lawyer",
            "action": "handcuffed",
            "object": "surgeon"
          },
          {
            "subject": "police officer",
            "action": "seated",
            "object": "lawyer"
          },
          {
            "subject": "waiter",
            "action": "rescued",
            "object": "police officer"
          },
          {
            "subject": "firefighter",
            "action": "disciplined",
            "object": "waiter"
          },
          {
            "subject": "principal",
            "action": "prescribed medicine to",
            "object": "firefighter"
          }
        ],
        "middle_entity": "police officer",
        "all_entities": [
          "principal",
          "doctor",
          "lawyer",
          "waiter",
          "police officer",
          "surgeon",
          "firefighter"
        ],
        "questions_by_entity": {
          "principal": [
            {
              "question": "What did the principal do?",
              "answer": "prescribe medicine to the firefighter",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "Who was affected by the principal?",
              "answer": "the firefighter",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity acted upon by the principal do?",
              "answer": "disciplined the waiter",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the principal's action?",
              "answer": "no prior events",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "principal",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the principal's involvement?",
              "answer": "the firefighter disciplined the waiter",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "principal",
              "is_middle_entity": false
            }
          ],
          "doctor": [
            {
              "question": "What did the doctor do?",
              "answer": "operate",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "doctor",
              "is_middle_entity": false
            },
            {
              "question": "Who subpoenaed the doctor?",
              "answer": "the surgeon",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "doctor",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "doctor",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was subpoenaed do?",
              "answer": "operated",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "doctor",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the doctor's action?",
              "answer": "the principal prescribing medicine to the firefighter which led to the firefighter disciplining the waiter which led to the waiter rescuing the police officer which led to the police officer seating the lawyer which led to the lawyer handcuffing the surgeon which led to the surgeon subpoenaing the doctor",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "doctor",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the doctor's involvement?",
              "answer": "none",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "doctor",
              "is_middle_entity": false
            }
          ],
          "lawyer": [
            {
              "question": "What did the lawyer do?",
              "answer": "handcuff the surgeon",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "Who seated the lawyer?",
              "answer": "the police officer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was seated do?",
              "answer": "handcuffed the surgeon",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the lawyer's action?",
              "answer": "the principal prescribing medicine to the firefighter which led to the firefighter disciplining the waiter which led to the waiter rescuing the police officer which led to the police officer seating the lawyer",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "lawyer",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the lawyer's involvement?",
              "answer": "the surgeon subpoenaed the doctor",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "lawyer",
              "is_middle_entity": false
            }
          ],
          "waiter": [
            {
              "question": "What did the waiter do?",
              "answer": "rescue the police officer",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "Who disciplined the waiter?",
              "answer": "the firefighter",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was disciplined do?",
              "answer": "rescued the police officer",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the waiter's action?",
              "answer": "the principal prescribing medicine to the firefighter which led to the firefighter disciplining the waiter",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "waiter",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the waiter's involvement?",
              "answer": "the police officer seated the lawyer",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "waiter",
              "is_middle_entity": false
            }
          ],
          "police officer": [
            {
              "question": "What did the police officer do?",
              "answer": "seat the lawyer",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "police officer",
              "is_middle_entity": true
            },
            {
              "question": "Who rescued the police officer?",
              "answer": "the waiter",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "police officer",
              "is_middle_entity": true
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "police officer",
              "is_middle_entity": true
            },
            {
              "question": "What did the entity that was rescued do?",
              "answer": "seated the lawyer",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "police officer",
              "is_middle_entity": true
            },
            {
              "question": "What series of events led to the police officer's action?",
              "answer": "the principal prescribing medicine to the firefighter which led to the firefighter disciplining the waiter which led to the waiter rescuing the police officer",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "police officer",
              "is_middle_entity": true
            },
            {
              "question": "What is the consequence of the police officer's involvement?",
              "answer": "the lawyer handcuffed the surgeon",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "police officer",
              "is_middle_entity": true
            }
          ],
          "surgeon": [
            {
              "question": "What did the surgeon do?",
              "answer": "subpoena the doctor",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "Who handcuffed the surgeon?",
              "answer": "the lawyer",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was handcuffed do?",
              "answer": "subpoenaed the doctor",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the surgeon's action?",
              "answer": "the principal prescribing medicine to the firefighter which led to the firefighter disciplining the waiter which led to the waiter rescuing the police officer which led to the police officer seating the lawyer which led to the lawyer handcuffing the surgeon",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "surgeon",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the surgeon's involvement?",
              "answer": "the doctor operated",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "surgeon",
              "is_middle_entity": false
            }
          ],
          "firefighter": [
            {
              "question": "What did the firefighter do?",
              "answer": "discipline the waiter",
              "type": "action_performed",
              "difficulty": "easy",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "Who prescribed medicine to the firefighter?",
              "answer": "the principal",
              "type": "agent_identification",
              "difficulty": "easy",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "How many distinct entities are in the sentence?",
              "answer": "7",
              "type": "entity_count",
              "difficulty": "medium",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "What did the entity that was prescribed medicine do?",
              "answer": "disciplined the waiter",
              "type": "nested_dependency",
              "difficulty": "medium",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "What series of events led to the firefighter's action?",
              "answer": "the principal prescribing medicine to the firefighter",
              "type": "causal_sequence",
              "difficulty": "hard",
              "entity": "firefighter",
              "is_middle_entity": false
            },
            {
              "question": "What is the consequence of the firefighter's involvement?",
              "answer": "the waiter rescued the police officer",
              "type": "chain_consequence",
              "difficulty": "hard",
              "entity": "firefighter",
              "is_middle_entity": false
            }
          ]
        },
        "total_questions": 42
      }
    ],
    "total_questions": 1260,
    "entities_processed": 210,
    "middle_entities_flagged": 30
  }
}