[
  {
    "video_index": 0,
    "video_filename": "videos/video_00000.gif",
    "num_frames": 64,
    "frame_size": 128,
    "fps": 25,
    "scene": {
      "objects": [
        {
          "idx": 0,
          "color": "blue",
          "shape": "cube",
          "material": "metal",
          "size": "small",
          "radius": 0.14201513451832787,
          "position": [
            -0.23966961428725875,
            -1.462209019449065
          ],
          "velocity": [
            -0.8609936860984196,
            -0.5796115807438419
          ],
          "spin": -0.3251429984155163,
          "is_probe": false
        },
        {
          "idx": 1,
          "color": "brown",
          "shape": "cylinder",
          "material": "metal",
          "size": "large",
          "radius": 0.31837243571439555,
          "position": [
            -1.164721842851352,
            0.5289356855502538
          ],
          "velocity": [
            0.0,
            0.0
          ],
          "spin": 1.170823056014377,
          "is_probe": false
        },
        {
          "idx": 2,
          "color": "green",
          "shape": "sphere",
          "material": "metal",
          "size": "large",
          "radius": 0.27405244964820474,
          "position": [
            0.4562874858801751,
            0.357693845591887
          ],
          "velocity": [
            0.18925657454551104,
            1.3095824406480492
          ],
          "spin": -1.2479539692528454,
          "is_probe": false
        },
        {
          "idx": 3,
          "color": "cyan",
          "shape": "cylinder",
          "material": "metal",
          "size": "small",
          "radius": 0.1917907353409932,
          "position": [
            -0.3605995817881613,
            1.5413508009465542
          ],
          "velocity": [
            0.0,
            0.0
          ],
          "spin": 0.9979324429601935,
          "is_probe": false
        },
        {
          "idx": 4,
          "color": "purple",
          "shape": "sphere",
          "material": "metal",
          "size": "small",
          "radius": 0.1724876732149455,
          "position": [
            1.4905895502063131,
            0.5751801518901536
          ],
          "velocity": [
            0.0,
            0.0
          ],
          "spin": 0.8612949224660502,
          "is_probe": false
        },
        {
          "idx": 5,
          "color": "gray",
          "shape": "sphere",
          "material": "metal",
          "size": "large",
          "radius": 0.28397695124299077,
          "position": [
            1.2074122864819008,
            1.345534899464374
          ],
          "velocity": [
            0.10522102901322228,
            1.5729688697009279
          ],
          "spin": -1.324295895584417,
          "is_probe": false
        }
      ]
    },
    "events": {
      "collision_events": [
        {
          "frame": 19,
          "objects": [
            4,
            5
          ],
          "description": "the purple sphere collided with the gray sphere"
        },
        {
          "frame": 61,
          "objects": [
            2,
            5
          ],
          "description": "the green sphere collided with the gray sphere"
        }
      ],
      "motion_events": [
        {
          "object": 4,
          "type": "start",
          "frame": 19,
          "cause_collision": {
            "frame": 19,
            "objects": [
              4,
              5
            ]
          }
        }
      ],
      "initially_moving": [
        0,
        2,
        5
      ]
    },
    "raw_events": {
      "collisions": [
        {
          "frame": 19,
          "objects": [
            4,
            5
          ]
        },
        {
          "frame": 61,
          "objects": [
            2,
            5
          ]
        }
      ],
      "starts": {
        "0": [],
        "1": [],
        "2": [],
        "3": [],
        "4": [
          19
        ],
        "5": []
      },
      "stops": {
        "0": [],
        "1": [],
        "2": [],
        "3": [],
        "4": [],
        "5": []
      },
      "initially_moving": [
        0,
        2,
        5
      ],
      "wall_hits": [
        [
          5,
          5,
          1,
          1
        ],
        [
          17,
          0,
          1,
          -1
        ],
        [
          27,
          2,
          1,
          1
        ],
        [
          30,
          4,
          0,
          1
        ],
        [
          52,
          0,
          0,
          -1
        ],
        [
          62,
          4,
          1,
          -1
        ]
      ]
    },
    "questions": [
      {
        "question": "Will the green sphere collide with the gray sphere by the end of the video?",
        "answer": "yes",
        "choices": [
          "yes",
          "no"
        ],
        "answer_index": 0,
        "question_type": "predictive",
        "template": "will_collide",
        "program": [
          {
            "op": "find_collision",
            "objects": [
              2,
              5
            ]
          },
          {
            "op": "query_existence"
          }
        ]
      },
      {
        "question": "If the cyan cylinder were removed, would the purple sphere still collide with the gray sphere?",
        "answer": "yes",
        "choices": [
          "no",
          "yes"
        ],
        "answer_index": 1,
        "question_type": "counterfactual",
        "template": "cf_collision",
        "program": [
          {
            "op": "remove_object",
            "idx": 3
          },
          {
            "op": "find_collision",
            "objects": [
              4,
              5
            ]
          },
          {
            "op": "query_existence"
          }
        ]
      },
      {
        "question": "What happened right before the green sphere collided with the gray sphere?",
        "answer": "the purple sphere collided with the gray sphere",
        "choices": [
          "the purple sphere collided with the wall",
          "the purple sphere started moving",
          "the purple sphere collided with the gray sphere",
          "nothing happened"
        ],
        "answer_index": 2,
        "question_type": "explanatory",
        "template": "what_happened_before",
        "program": [
          {
            "op": "find_collision",
            "objects": [
              2,
              5
            ]
          },
          {
            "op": "query_before_event"
          }
        ]
      },
      {
        "question": "What shape is the green object?",
        "answer": "sphere",
        "choices": [
          "cube",
          "sphere",
          "cylinder"
        ],
        "answer_index": 1,
        "question_type": "descriptive",
        "template": "query_shape",
        "program": [
          {
            "op": "filter_color",
            "value": "green"
          },
          {
            "op": "query_shape"
          }
        ]
      },
      {
        "question": "What shape is the blue object?",
        "answer": "cube",
        "choices": [
          "cylinder",
          "sphere",
          "cube"
        ],
        "answer_index": 2,
        "question_type": "descriptive",
        "template": "query_shape",
        "program": [
          {
            "op": "filter_color",
            "value": "blue"
          },
          {
            "op": "query_shape"
          }
        ]
      },
      {
        "question": "What color is the object left of the blue cube?",
        "answer": "brown",
        "choices": [
          "cyan",
          "green",
          "gray",
          "red",
          "brown",
          "blue",
          "yellow",
          "purple"
        ],
        "answer_index": 4,
        "question_type": "descriptive",
        "template": "query_color_rel",
        "program": [
          {
            "op": "filter_color",
            "value": "blue"
          },
          {
            "op": "relate",
            "direction": "left_of"
          },
          {
            "op": "query_color"
          }
        ]
      },
      {
        "question": "If the cyan cylinder were removed, would the purple sphere still start moving?",
        "answer": "yes",
        "choices": [
          "no",
          "yes"
        ],
        "answer_index": 1,
        "question_type": "counterfactual",
        "template": "cf_motion",
        "program": [
          {
            "op": "remove_object",
            "idx": 3
          },
          {
            "op": "filter_object",
            "idx": 4
          },
          {
            "op": "query_motion_start"
          }
        ]
      },
      {
        "question": "How many objects were moving when the purple sphere collided with the gray sphere?",
        "answer": "4",
        "choices": [
          "0",
          "1",
          "2",
          "3",
          "4",
          "5"
        ],
        "answer_index": 4,
        "question_type": "explanatory",
        "template": "count_moving_at",
        "program": [
          {
            "op": "find_collision",
            "objects": [
              4,
              5
            ]
          },
          {
            "op": "count_moving_at_collision"
          }
        ]
      }
    ]
  },
  {
    "video_index": 1,
    "video_filename": "videos/video_00001.gif",
    "num_frames": 64,
    "frame_size": 128,
    "fps": 25,
    "scene": {
      "objects": [
        {
          "idx": 0,
          "color": "purple",
          "shape": "cylinder",
          "material": "rubber",
          "size": "small",
          "radius": 0.17228859879315672,
          "position": [
            -0.14415654260998023,
            -1.1344707385337893
          ],
          "velocity": [
            0.0,
            0.0
          ],
          "spin": -0.6693263878638875,
          "is_probe": false
        },
        {
          "idx": 1,
          "color": "gray",
          "shape": "sphere",
          "material": "rubber",
          "size": "small",
          "radius": 0.15978390298994555,
          "position": [
            -0.7368286446302665,
            0.776130485153163
          ],
          "velocity": [
            0.8890070987191017,
            1.4136185002086372
          ],
          "spin": 0.04820575664363602,
          "is_probe": false
        },
        {
          "idx": 2,
          "color": "red",
          "shape": "cube",
          "material": "metal",
          "size": "large",
          "radius": 0.32307429627427237,
          "position": [
            -0.6807328502432762,
            -0.04590797926193124
          ],
          "velocity": [
            0.0,
            0.0
          ],
          "spin": -1.1524031625876892,
          "is_probe": false
        },
        {
          "idx": 3,
          "color": "brown",
          "shape": "cylinder",
          "material": "metal",
          "size": "large",
          "radius": 0.2842555863433316,
          "position": [
            1.4902853193838397,
            1.431137300357739
          ],
          "velocity": [
            -1.0540337912642956,
            -1.03421747570648
          ],
          "spin": 0.3390099031591214,
          "is_probe": false
        }
      ]
    },
    "events": {
      "collision_events": [
        {
          "frame": 40,
          "objects": [
            2,
            3
          ],
          "description": "the red cube collided with the brown cylinder"
        },
        {
          "frame": 55,
          "objects": [
            0,
            3
          ],
          "description": "the purple cylinder collided with the brown cylinder"
        }
      ],
      "motion_events": [
        {
          "object": 0,
          "type": "start",
          "frame": 55,
          "cause_collision": {
            "frame": 55,
            "objects": [
              0,
              3
            ]
          }
        },
        {
          "object": 2,
          "type": "start",
          "frame": 40,
          "cause_collision": {
            "frame": 40,
            "objects": [
              2,
              3
            ]
          }
        }
      ],
      "initially_moving": [
        1,
        3
      ]
    },
    "raw_events": {
      "collisions": [
        {
          "frame": 40,
          "objects": [
            2,
            3
          ]
        },
        {
          "frame": 55,
          "objects": [
            0,
            3
          ]
        }
      ],
      "starts": {
        "0": [
          55
        ],
        "1": [],
        "2": [
          40
        ],
        "3": []
      },
      "stops": {
        "0": [],
        "1": [],
        "2": [],
        "3": []
      },
      "initially_moving": [
        1,
        3
      ],
      "wall_hits": [
        [
          19,
          1,
          1,
          1
        ]
      ]
    },
    "questions": [
      {
        "question": "After the red cube collided with the brown cylinder, will the red cube collide with something else?",
        "answer": "no",
        "choices": [
          "no",
          "yes"
        ],
        "answer_index": 0,
        "question_type": "predictive",
        "template": "will_collide_again",
        "program": [
          {
            "op": "find_collision",
            "objects": [
              2,
              3
            ]
          },
          {
            "op": "query_subsequent_collision"
          }
        ]
      },
      {
        "question": "What caused the purple cylinder to start moving?",
        "answer": "the collision with the brown cylinder",
        "choices": [
          "it was pushed by the wall",
          "nothing - it was already moving",
          "the collision with the red cube",
          "the collision with the brown cylinder"
        ],
        "answer_index": 3,
        "question_type": "explanatory",
        "template": "cause_of_motion",
        "program": [
          {
            "op": "filter_object",
            "idx": 0
          },
          {
            "op": "query_motion_cause"
          }
        ]
      },
      {
        "question": "If the brown cylinder were removed, would the purple cylinder still start moving?",
        "answer": "no",
        "choices": [
          "yes",
          "no"
        ],
        "answer_index": 1,
        "question_type": "counterfactual",
        "template": "cf_motion",
        "program": [
          {
            "op": "remove_object",
            "idx": 3
          },
          {
            "op": "filter_object",
            "idx": 0
          },
          {
            "op": "query_motion_start"
          }
        ]
      },
      {
        "question": "If the gray sphere were removed, would the purple cylinder still collide with the brown cylinder?",
        "answer": "yes",
        "choices": [
          "no",
          "yes"
        ],
        "answer_index": 1,
        "question_type": "counterfactual",
        "template": "cf_collision",
        "program": [
          {
            "op": "remove_object",
            "idx": 1
          },
          {
            "op": "find_collision",
            "objects": [
              0,
              3
            ]
          },
          {
            "op": "query_existence"
          }
        ]
      },
      {
        "question": "How many objects are there?",
        "answer": "4",
        "choices": [
          "0",
          "1",
          "2",
          "3",
          "4",
          "5"
        ],
        "answer_index": 4,
        "question_type": "descriptive",
        "template": "count_all",
        "program": [
          {
            "op": "count"
          }
        ]
      },
      {
        "question": "How many sphere objects are there?",
        "answer": "1",
        "choices": [
          "0",
          "1",
          "3",
          "4",
          "5",
          "6"
        ],
        "answer_index": 1,
        "question_type": "descriptive",
        "template": "count_shape",
        "program": [
          {
            "op": "filter_shape",
            "value": "sphere"
          },
          {
            "op": "count"
          }
        ]
      },
      {
        "question": "How many collisions happened in the video?",
        "answer": "2",
        "choices": [
          "0",
          "1",
          "2",
          "3",
          "5",
          "6"
        ],
        "answer_index": 2,
        "question_type": "explanatory",
        "template": "count_collisions",
        "program": [
          {
            "op": "filter_event",
            "type": "collision"
          },
          {
            "op": "count"
          }
        ]
      },
      {
        "question": "What shape is the gray object?",
        "answer": "sphere",
        "choices": [
          "cube",
          "cylinder",
          "sphere"
        ],
        "answer_index": 2,
        "question_type": "descriptive",
        "template": "query_shape",
        "program": [
          {
            "op": "filter_color",
            "value": "gray"
          },
          {
            "op": "query_shape"
          }
        ]
      }
    ]
  },
  {
    "video_index": 2,
    "video_filename": "videos/video_00002.gif",
    "num_frames": 64,
    "frame_size": 128,
    "fps": 25,
    "scene": {
      "objects": [
        {
          "idx": 0,
          "color": "blue",
          "shape": "cylinder",
          "material": "rubber",
          "size": "large",
          "radius": 0.33739487619949415,
          "position": [
            1.2127491694517956,
            0.8542482216653375
          ],
          "velocity": [
            -0.36715859956078306,
            -0.9719919196853971
          ],
          "spin": 0.0684855117712917,
          "is_probe": false
        },
        {
          "idx": 1,
          "color": "yellow",
          "shape": "cube",
          "material": "metal",
          "size": "large",
          "radius": 0.31464518578477,
          "position": [
            -0.5637455380923395,
            1.315072379171155
          ],
          "velocity": [
            0.16865636414440546,
            0.7827396049255161
          ],
          "spin": -1.3841876102370936,
          "is_probe": false
        },
        {
          "idx": 2,
          "color": "cyan",
          "shape": "sphere",
          "material": "rubber",
          "size": "large",
          "radius": 0.2913299866464021,
          "position": [
            -0.09017935521115161,
            0.6006524108269133
          ],
          "velocity": [
            -0.3438585017186605,
            -1.104125496358226
          ],
          "spin": 1.1932024412795266,
          "is_probe": false
        },
        {
          "idx": 3,
          "color": "purple",
          "shape": "cube",
          "material": "rubber",
          "size": "small",
          "radius": 0.1512351541832059,
          "position": [
            -1.2176573437938771,
            -1.2259149688578814
          ],
          "velocity": [
            0.0,
            0.0
          ],
          "spin": 1.005549614076839,
          "is_probe": false
        },
        {
          "idx": 4,
          "color": "red",
          "shape": "cube",
          "material": "metal",
          "size": "small",
          "radius": 0.160757639934304,
          "position": [
            0.44775243453710445,
            -0.2897185672058369
          ],
          "velocity": [
            0.0,
            0.0
          ],
          "spin": -0.3447145965575502,
          "is_probe": false
        },
        {
          "idx": 5,
          "color": "green",
          "shape": "sphere",
          "material": "rubber",
          "size": "large",
          "radius": 0.3008852778855662,
          "position": [
            1.1225657532136475,
            -0.19162288490671253
          ],
          "velocity": [
            0.0,
            0.0
          ],
          "spin": 1.421036309115669,
          "is_probe": false
        }
      ]
    },
    "events": {
      "collision_events": [
        {
          "frame": 10,
          "objects": [
            0,
            5
          ],
          "description": "the blue cylinder collided with the green sphere"
        },
        {
          "frame": 48,
          "objects": [
            0,
            4
          ],
          "description": "the blue cylinder collided with the red cube"
        },
        {
          "frame": 57,
          "objects": [
            0,
            1
          ],
          "description": "the blue cylinder collided with the yellow cube"
        },
        {
          "frame": 61,
          "objects": [
            0,
            4
          ],
          "description": "the blue cylinder collided with the red cube"
        }
      ],
      "motion_events": [
        {
          "object": 4,
          "type": "start",
          "frame": 48,
          "cause_collision": {
            "frame": 48,
            "objects": [
              0,
              4
            ]
          }
        },
        {
          "object": 5,
          "type": "start",
          "frame": 10,
          "cause_collision": {
            "frame": 10,
            "objects": [
              0,
              5
            ]
          }
        }
      ],
      "initially_moving": [
        0,
        1,
        2
      ]
    },
    "raw_events": {
      "collisions": [
        {
          "frame": 10,
          "objects": [
            0,
            5
          ]
        },
        {
          "frame": 48,
          "objects": [
            0,
            4
          ]
        },
        {
          "frame": 57,
          "objects": [
            0,
            1
          ]
        },
        {
          "frame": 61,
          "objects": [
            0,
            4
          ]
        }
      ],
      "starts": {
        "0": [],
        "1": [],
        "2": [],
        "3": [],
        "4": [
          48
        ],
        "5": [
          10
        ]
      },
      "stops": {
        "0": [],
        "1": [],
        "2": [],
        "3": [],
        "4": [],
        "5": []
      },
      "initially_moving": [
        0,
        1,
        2
      ],
      "wall_hits": [
        [
          12,
          1,
          1,
          1
        ],
        [
          53,
          5,
          1,
          -1
        ],
        [
          58,
          2,
          1,
          -1
        ]
      ]
    },
    "questions": [
      {
        "question": "What happened right after the blue cylinder collided with the red cube?",
        "answer": "nothing happened",
        "choices": [
          "the yellow cube collided with the wall",
          "nothing happened",
          "the cyan sphere collided with the wall",
          "the blue cylinder collided with the green sphere"
        ],
        "answer_index": 1,
        "question_type": "explanatory",
        "template": "what_happened_after",
        "program": [
          {
            "op": "find_collision",
            "objects": [
              0,
              4
            ]
          },
          {
            "op": "query_after_event"
          }
        ]
      },
      {
        "question": "If the green sphere were removed, would the blue cylinder still collide with the red cube?",
        "answer": "yes",
        "choices": [
          "yes",
          "no"
        ],
        "answer_index": 0,
        "question_type": "counterfactual",
        "template": "cf_collision",
        "program": [
          {
            "op": "remove_object",
            "idx": 5
          },
          {
            "op": "find_collision",
            "objects": [
              0,
              4
            ]
          },
          {
            "op": "query_existence"
          }
        ]
      },
      {
        "question": "If the red cube were removed, would the blue cylinder still collide with the yellow cube?",
        "answer": "yes",
        "choices": [
          "yes",
          "no"
        ],
        "answer_index": 0,
        "question_type": "counterfactual",
        "template": "cf_collision",
        "program": [
          {
            "op": "remove_object",
            "idx": 4
          },
          {
            "op": "find_collision",
            "objects": [
              0,
              1
            ]
          },
          {
            "op": "query_existence"
          }
        ]
      },
      {
        "question": "What material is the yellow cube made of?",
        "answer": "metal",
        "choices": [
          "rubber",
          "metal"
        ],
        "answer_index": 1,
        "question_type": "descriptive",
        "template": "query_material",
        "program": [
          {
            "op": "filter_color",
            "value": "yellow"
          },
          {
            "op": "filter_shape",
            "value": "cube"
          },
          {
            "op": "query_material"
          }
        ]
      },
      {
        "question": "How many purple objects are there?",
        "answer": "1",
        "choices": [
          "0",
          "1",
          "2",
          "3",
          "4",
          "6"
        ],
        "answer_index": 1,
        "question_type": "descriptive",
        "template": "count_color",
        "program": [
          {
            "op": "filter_color",
            "value": "purple"
          },
          {
            "op": "count"
          }
        ]
      },
      {
        "question": "After the blue cylinder collided with the red cube, will the blue cylinder collide with something else?",
        "answer": "yes",
        "choices": [
          "yes",
          "no"
        ],
        "answer_index": 0,
        "question_type": "predictive",
        "template": "will_collide_again",
        "program": [
          {
            "op": "find_collision",
            "objects": [
              0,
              4
            ]
          },
          {
            "op": "query_subsequent_collision"
          }
        ]
      },
      {
        "question": "How many objects were moving when the blue cylinder collided with the red cube?",
        "answer": "5",
        "choices": [
          "0",
          "1",
          "3",
          "4",
          "5",
          "6"
        ],
        "answer_index": 4,
        "question_type": "explanatory",
        "template": "count_moving_at",
        "program": [
          {
            "op": "find_collision",
            "objects": [
              0,
              4
            ]
          },
          {
            "op": "count_moving_at_collision"
          }
        ]
      },
      {
        "question": "What shape is the purple object?",
        "answer": "cube",
        "choices": [
          "cylinder",
          "sphere",
          "cube"
        ],
        "answer_index": 2,
        "question_type": "descriptive",
        "template": "query_shape",
        "program": [
          {
            "op": "filter_color",
            "value": "purple"
          },
          {
            "op": "query_shape"
          }
        ]
      }
    ]
  },
  {
    "video_index": 3,
    "video_filename": "videos/video_00003.gif",
    "num_frames": 64,
    "frame_size": 128,
    "fps": 25,
    "scene": {
      "objects": [
        {
          "idx": 0,
          "color": "yellow",
          "shape": "cube",
          "material": "metal",
          "size": "large",
          "radius": 0.3190270229833728,
          "position": [
            -1.545380741122608,
            1.4677268517758797
          ],
          "velocity": [
            0.653208134845669,
            -1.1901842959224622
          ],
          "spin": 0.5483967235810505,
          "is_probe": false
        },
        {
          "idx": 1,
          "color": "gray",
          "shape": "sphere",
          "material": "metal",
          "size": "large",
          "radius": 0.3365013803868879,
          "position": [
            -0.6249562086476854,
            -0.576643393693556
          ],
          "velocity": [
            0.0,
            0.0
          ],
          "spin": 0.960227250511605,
          "is_probe": false
        },
        {
          "idx": 2,
          "color": "blue",
          "shape": "sphere",
          "material": "rubber",
          "size": "small",
          "radius": 0.1570520698249275,
          "position": [
            1.2143043183799873,
            0.2640051136618149
          ],
          "velocity": [
            0.0,
            0.0
          ],
          "spin": -0.21428128710461403,
          "is_probe": false
        },
        {
          "idx": 3,
          "color": "red",
          "shape": "sphere",
          "material": "rubber",
          "size": "small",
          "radius": 0.1789128324247895,
          "position": [
            -0.08894003793632277,
            0.847158729911331
          ],
          "velocity": [
            0.0,
            0.0
          ],
          "spin": 0.7761163834647569,
          "is_probe": false
        },
        {
          "idx": 4,
          "color": "brown",
          "shape": "cube",
          "material": "rubber",
          "size": "large",
          "radius": 0.31569727973361245,
          "position": [
            0.49755020902647407,
            1.3375379496981992
          ],
          "velocity": [
            0.0,
            0.0
          ],
          "spin": 1.1354405539987615,
          "is_probe": false
        },
        {
          "idx": 5,
          "color": "cyan",
          "shape": "cube",
          "material": "rubber",
          "size": "large",
          "radius": 0.283417659920999,
          "position": [
            -0.9077073789488962,
            0.40327961933456313
          ],
          "velocity": [
            1.2403780112124232,
            0.9291094064281774
          ],
          "spin": -0.31821800210299456,
          "is_probe": false
        }
      ]
    },
    "events": {
      "collision_events": [
        {
          "frame": 7,
          "objects": [
            3,
            5
          ],
          "description": "the red sphere collided with the cyan cube"
        },
        {
          "frame": 11,
          "objects": [
            3,
            4
          ],
          "description": "the red sphere collided with the brown cube"
        },
        {
          "frame": 31,
          "objects": [
            0,
            1
          ],
          "description": "the yellow cube collided with the gray sphere"
        }
      ],
      "motion_events": [
        {
          "object": 1,
          "type": "start",
          "frame": 31,
          "cause_collision": {
            "frame": 31,
            "objects": [
              0,
              1
            ]
          }
        },
        {
          "object": 3,
          "type": "start",
          "frame": 7,
          "cause_collision": {
            "frame": 7,
            "objects": [
              3,
              5
            ]
          }
        },
        {
          "object": 4,
          "type": "start",
          "frame": 11,
          "cause_collision": {
            "frame": 11,
            "objects": [
              3,
              4
            ]
          }
        }
      ],
      "initially_moving": [
        0,
        5
      ]
    },
    "raw_events": {
      "collisions": [
        {
          "frame": 7,
          "objects": [
            3,
            5
          ]
        },
        {
          "frame": 11,
          "objects": [
            3,
            4
          ]
        },
        {
          "frame": 31,
          "objects": [
            0,
            1
          ]
        }
      ],
      "starts": {
        "0": [],
        "1": [
          31
        ],
        "2": [],
        "3": [
          7
        ],
        "4": [
          11
        ],
        "5": []
      },
      "stops": {
        "0": [],
        "1": [],
        "2": [],
        "3": [],
        "4": [],
        "5": []
      },
      "initially_moving": [
        0,
        5
      ],
      "wall_hits": [
        [
          26,
          4,
          1,
          1
        ],
        [
          51,
          5,
          1,
          1
        ],
        [
          59,
          1,
          1,
          -1
        ]
      ]
    },
    "questions": [
      {
        "question": "If the cyan cube were removed, would the red sphere still start moving?",
        "answer": "no",
        "choices": [
          "yes",
          "no"
        ],
        "answer_index": 1,
        "question_type": "counterfactual",
        "template": "cf_motion",
        "program": [
          {
            "op": "remove_object",
            "idx": 5
          },
          {
            "op": "filter_object",
            "idx": 3
          },
          {
            "op": "query_motion_start"
          }
        ]
      },
      {
        "question": "If the blue sphere were removed, would the red sphere still collide with the cyan cube?",
        "answer": "yes",
        "choices": [
          "yes",
          "no"
        ],
        "answer_index": 0,
        "question_type": "counterfactual",
        "template": "cf_collision",
        "program": [
          {
            "op": "remove_object",
            "idx": 2
          },
          {
            "op": "find_collision",
            "objects": [
              3,
              5
            ]
          },
          {
            "op": "query_existence"
          }
        ]
      },
      {
        "question": "How many red objects are there?",
        "answer": "1",
        "choices": [
          "1",
          "2",
          "3",
          "4",
          "5",
          "6"
        ],
        "answer_index": 0,
        "question_type": "descriptive",
        "template": "count_color",
        "program": [
          {
            "op": "filter_color",
            "value": "red"
          },
          {
            "op": "count"
          }
        ]
      },
      {
        "question": "What happened right after the red sphere collided with the cyan cube?",
        "answer": "the red sphere collided with the brown cube",
        "choices": [
          "the red sphere collided with the brown cube",
          "the yellow cube collided with the gray sphere",
          "nothing happened",
          "the cyan cube collided with the wall"
        ],
        "answer_index": 0,
        "question_type": "explanatory",
        "template": "what_happened_after",
        "program": [
          {
            "op": "find_collision",
            "objects": [
              3,
              5
            ]
          },
          {
            "op": "query_after_event"
          }
        ]
      },
      {
        "question": "Will the red sphere collide with the cyan cube by the end of the video?",
        "answer": "yes",
        "choices": [
          "no",
          "yes"
        ],
        "answer_index": 1,
        "question_type": "predictive",
        "template": "will_collide",
        "program": [
          {
            "op": "find_collision",
            "objects": [
              3,
              5
            ]
          },
          {
            "op": "query_existence"
          }
        ]
      },
      {
        "question": "What happened right after the red sphere collided with the brown cube?",
        "answer": "the yellow cube collided with the gray sphere",
        "choices": [
          "nothing happened",
          "the gray sphere started moving",
          "the brown cube started moving",
          "the yellow cube collided with the gray sphere"
        ],
        "answer_index": 3,
        "question_type": "explanatory",
        "template": "what_happened_after",
        "program": [
          {
            "op": "find_collision",
            "objects": [
              3,
              4
            ]
          },
          {
            "op": "query_after_event"
          }
        ]
      },
      {
        "question": "What material is the brown cube made of?",
        "answer": "rubber",
        "choices": [
          "metal",
          "rubber"
        ],
        "answer_index": 1,
        "question_type": "descriptive",
        "template": "query_material",
        "program": [
          {
            "op": "filter_color",
            "value": "brown"
          },
          {
            "op": "filter_shape",
            "value": "cube"
          },
          {
            "op": "query_material"
          }
        ]
      },
      {
        "question": "What color is the object in front of the blue sphere?",
        "answer": "gray",
        "choices": [
          "blue",
          "yellow",
          "gray",
          "brown",
          "cyan",
          "red",
          "purple",
          "green"
        ],
        "answer_index": 2,
        "question_type": "descriptive",
        "template": "query_color_rel",
        "program": [
          {
            "op": "filter_color",
            "value": "blue"
          },
          {
            "op": "relate",
            "direction": "in_front_of"
          },
          {
            "op": "query_color"
          }
        ]
      }
    ]
  },
  {
    "video_index": 4,
    "video_filename": "videos/video_00004.gif",
    "num_frames": 64,
    "frame_size": 128,
    "fps": 25,
    "scene": {
      "objects": [
        {
          "idx": 0,
          "color": "red",
          "shape": "sphere",
          "material": "metal",
          "size": "small",
          "radius": 0.1658297766637648,
          "position": [
            1.3299818020728005,
            -0.9991529841378586
          ],
          "velocity": [
            0.0,
            0.0
          ],
          "spin": -0.07188326857379423,
          "is_probe": false
        },
        {
          "idx": 1,
          "color": "cyan",
          "shape": "sphere",
          "material": "metal",
          "size": "large",
          "radius": 0.3231157374035464,
          "position": [
            0.3374400122180976,
            0.635080711250702
          ],
          "velocity": [
            0.0,
            0.0
          ],
          "spin": -0.8490599207340147,
          "is_probe": false
        },
        {
          "idx": 2,
          "color": "blue",
          "shape": "cube",
          "material": "rubber",
          "size": "small",
          "radius": 0.1990491799958673,
          "position": [
            1.3726914053004184,
            0.5135379925938357
          ],
          "velocity": [
            -0.519380992006974,
            -1.3758624215162312
          ],
          "spin": -0.9276344842243871,
          "is_probe": false
        },
        {
          "idx": 3,
          "color": "gray",
          "shape": "sphere",
          "material": "metal",
          "size": "large",
          "radius": 0.28957806341219433,
          "position": [
            -1.1364731580997514,
            -0.006610443765339147
          ],
          "velocity": [
            -1.0283166962197308,
            0.26460535465147544
          ],
          "spin": -0.9878105416611754,
          "is_probe": false
        },
        {
          "idx": 4,
          "color": "yellow",
          "shape": "sphere",
          "material": "metal",
          "size": "small",
          "radius": 0.1981359721589741,
          "position": [
            0.254248982005842,
            -0.7197164900960757
          ],
          "velocity": [
            0.2976426213341292,
            1.6356465885638267
          ],
          "spin": 1.152669154895344,
          "is_probe": false
        }
      ]
    },
    "events": {
      "collision_events": [
        {
          "frame": 13,
          "objects": [
            1,
            4
          ],
          "description": "the cyan sphere collided with the yellow sphere"
        },
        {
          "frame": 50,
          "objects": [
            0,
            4
          ],
          "description": "the red sphere collided with the yellow sphere"
        }
      ],
      "motion_events": [
        {
          "object": 0,
          "type": "start",
          "frame": 50,
          "cause_collision": {
            "frame": 50,
            "objects": [
              0,
              4
            ]
          }
        },
        {
          "object": 1,
          "type": "start",
          "frame": 13,
          "cause_collision": {
            "frame": 13,
            "objects": [
              1,
              4
            ]
          }
        }
      ],
      "initially_moving": [
        2,
        3,
        4
      ]
    },
    "raw_events": {
      "collisions": [
        {
          "frame": 13,
          "objects": [
            1,
            4
          ]
        },
        {
          "frame": 50,
          "objects": [
            0,
            4
          ]
        }
      ],
      "starts": {
        "0": [
          50
        ],
        "1": [
          13
        ],
        "2": [],
        "3": [],
        "4": []
      },
      "stops": {
        "0": [],
        "1": [],
        "2": [],
        "3": [],
        "4": []
      },
      "initially_moving": [
        2,
        3,
        4
      ],
      "wall_hits": [
        [
          14,
          3,
          0,
          -1
        ],
        [
          46,
          2,
          1,
          -1
        ],
        [
          48,
          1,
          1,
          1
        ]
      ]
    },
    "questions": [
      {
        "question": "What happened right after the cyan sphere collided with the yellow sphere?",
        "answer": "the red sphere collided with the yellow sphere",
        "choices": [
          "the red sphere started moving",
          "the red sphere collided with the yellow sphere",
          "the cyan sphere started moving",
          "the gray sphere collided with the wall"
        ],
        "answer_index": 1,
        "question_type": "explanatory",
        "template": "what_happened_after",
        "program": [
          {
            "op": "find_collision",
            "objects": [
              1,
              4
            ]
          },
          {
            "op": "query_after_event"
          }
        ]
      },
      {
        "question": "If the cyan sphere were removed, would the red sphere still start moving?",
        "answer": "no",
        "choices": [
          "no",
          "yes"
        ],
        "answer_index": 0,
        "question_type": "counterfactual",
        "template": "cf_motion",
        "program": [
          {
            "op": "remove_object",
            "idx": 1
          },
          {
            "op": "filter_object",
            "idx": 0
          },
          {
            "op": "query_motion_start"
          }
        ]
      },
      {
        "question": "What shape is the cyan object?",
        "answer": "sphere",
        "choices": [
          "sphere",
          "cylinder",
          "cube"
        ],
        "answer_index": 0,
        "question_type": "descriptive",
        "template": "query_shape",
        "program": [
          {
            "op": "filter_color",
            "value": "cyan"
          },
          {
            "op": "query_shape"
          }
        ]
      },
      {
        "question": "What shape is the red object?",
        "answer": "sphere",
        "choices": [
          "cube",
          "cylinder",
          "sphere"
        ],
        "answer_index": 2,
        "question_type": "descriptive",
        "template": "query_shape",
        "program": [
          {
            "op": "filter_color",
            "value": "red"
          },
          {
            "op": "query_shape"
          }
        ]
      },
      {
        "question": "If the yellow sphere were removed, would the red sphere still start moving?",
        "answer": "no",
        "choices": [
          "yes",
          "no"
        ],
        "answer_index": 1,
        "question_type": "counterfactual",
        "template": "cf_motion",
        "program": [
          {
            "op": "remove_object",
            "idx": 4
          },
          {
            "op": "filter_object",
            "idx": 0
          },
          {
            "op": "query_motion_start"
          }
        ]
      },
      {
        "question": "What caused the red sphere to start moving?",
        "answer": "the collision with the yellow sphere",
        "choices": [
          "the collision with the cyan sphere",
          "the collision with the yellow sphere",
          "nothing - it was already moving",
          "it was pushed by the wall"
        ],
        "answer_index": 1,
        "question_type": "explanatory",
        "template": "cause_of_motion",
        "program": [
          {
            "op": "filter_object",
            "idx": 0
          },
          {
            "op": "query_motion_cause"
          }
        ]
      },
      {
        "question": "What shape is the yellow object?",
        "answer": "sphere",
        "choices": [
          "sphere",
          "cube",
          "cylinder"
        ],
        "answer_index": 0,
        "question_type": "descriptive",
        "template": "query_shape",
        "program": [
          {
            "op": "filter_color",
            "value": "yellow"
          },
          {
            "op": "query_shape"
          }
        ]
      },
      {
        "question": "Will the red sphere collide with the cyan sphere by the end of the video?",
        "answer": "no",
        "choices": [
          "yes",
          "no"
        ],
        "answer_index": 1,
        "question_type": "predictive",
        "template": "will_collide",
        "program": [
          {
            "op": "find_collision",
            "objects": [
              0,
              1
            ]
          },
          {
            "op": "query_existence"
          }
        ]
      }
    ]
  },
  {
    "video_index": 5,
    "video_filename": "videos/video_00005.gif",
    "num_frames": 64,
    "frame_size": 128,
    "fps": 25,
    "scene": {
      "objects": [
        {
          "idx": 0,
          "color": "red",
          "shape": "cylinder",
          "material": "rubber",
          "size": "small",
          "radius": 0.16609685313350853,
          "position": [
            -0.02162864193159808,
            0.5477369906763048
          ],
          "velocity": [
            0.0,
            0.0
          ],
          "spin": -1.496400949239514,
          "is_probe": false
        },
        {
          "idx": 1,
          "color": "brown",
          "shape": "cube",
          "material": "rubber",
          "size": "large",
          "radius": 0.33793489546074046,
          "position": [
            -1.3615115898300263,
            0.17234796245424255
          ],
          "velocity": [
            -1.1364131596450517,
            -0.02402328219120739
          ],
          "spin": -0.8902414916563056,
          "is_probe": false
        },
        {
          "idx": 2,
          "color": "blue",
          "shape": "cube",
          "material": "rubber",
          "size": "small",
          "radius": 0.19386065648651293,
          "position": [
            -0.7085000259566853,
            1.1769186373382585
          ],
          "velocity": [
            0.0,
            0.0
          ],
          "spin": -0.5251720662731818,
          "is_probe": false
        },
        {
          "idx": 3,
          "color": "green",
          "shape": "sphere",
          "material": "rubber",
          "size": "large",
          "radius": 0.3275384830086993,
          "position": [
            1.1472743572152606,
            -0.8453125720011849
          ],
          "velocity": [
            0.0,
            0.0
          ],
          "spin": 0.9186459930811308,
          "is_probe": false
        },
        {
          "idx": 4,
          "color": "gray",
          "shape": "sphere",
          "material": "rubber",
          "size": "large",
          "radius": 0.2913923731467823,
          "position": [
            1.2258895421837905,
            1.1538059508754384
          ],
          "velocity": [
            -0.34428904618230377,
            0.7761002312894555
          ],
          "spin": 0.5955359709549324,
          "is_probe": false
        }
      ]
    },
    "events": {
      "collision_events": [
        {
          "frame": 43,
          "objects": [
            0,
            1
          ],
          "description": "the red cylinder collided with the brown cube"
        },
        {
          "frame": 52,
          "objects": [
            0,
            4
          ],
          "description": "the red cylinder collided with the gray sphere"
        }
      ],
      "motion_events": [
        {
          "object": 0,
          "type": "start",
          "frame": 43,
          "cause_collision": {
            "frame": 43,
            "objects": [
              0,
              1
            ]
          }
        }
      ],
      "initially_moving": [
        1,
        4
      ]
    },
    "raw_events": {
      "collisions": [
        {
          "frame": 43,
          "objects": [
            0,
            1
          ]
        },
        {
          "frame": 52,
          "objects": [
            0,
            4
          ]
        }
      ],
      "starts": {
        "0": [
          43
        ],
        "1": [],
        "2": [],
        "3": [],
        "4": []
      },
      "stops": {
        "0": [],
        "1": [],
        "2": [],
        "3": [],
        "4": []
      },
      "initially_moving": [
        1,
        4
      ],
      "wall_hits": [
        [
          6,
          1,
          0,
          -1
        ],
        [
          18,
          4,
          1,
          1
        ]
      ]
    },
    "questions": [
      {
        "question": "How many red objects are there?",
        "answer": "1",
        "choices": [
          "0",
          "1",
          "2",
          "3",
          "4",
          "6"
        ],
        "answer_index": 1,
        "question_type": "descriptive",
        "template": "count_color",
        "program": [
          {
            "op": "filter_color",
            "value": "red"
          },
          {
            "op": "count"
          }
        ]
      },
      {
        "question": "How many green objects are there?",
        "answer": "1",
        "choices": [
          "0",
          "1",
          "3",
          "4",
          "5",
          "6"
        ],
        "answer_index": 1,
        "question_type": "descriptive",
        "template": "count_color",
        "program": [
          {
            "op": "filter_color",
            "value": "green"
          },
          {
            "op": "count"
          }
        ]
      },
      {
        "question": "After the red cylinder collided with the gray sphere, will the red cylinder collide with something else?",
        "answer": "no",
        "choices": [
          "no",
          "yes"
        ],
        "answer_index": 0,
        "question_type": "predictive",
        "template": "will_collide_again",
        "program": [
          {
            "op": "find_collision",
            "objects": [
              0,
              4
            ]
          },
          {
            "op": "query_subsequent_collision"
          }
        ]
      },
      {
        "question": "If the gray sphere were removed, would the red cylinder still collide with the brown cube?",
        "answer": "yes",
        "choices": [
          "no",
          "yes"
        ],
        "answer_index": 1,
        "question_type": "counterfactual",
        "template": "cf_collision",
        "program": [
          {
            "op": "remove_object",
            "idx": 4
          },
          {
            "op": "find_collision",
            "objects": [
              0,
              1
            ]
          },
          {
            "op": "query_existence"
          }
        ]
      },
      {
        "question": "How many collisions happened in the video?",
        "answer": "2",
        "choices": [
          "0",
          "1",
          "2",
          "3",
          "4",
          "6"
        ],
        "answer_index": 2,
        "question_type": "explanatory",
        "template": "count_collisions",
        "program": [
          {
            "op": "filter_event",
            "type": "collision"
          },
          {
            "op": "count"
          }
        ]
      },
      {
        "question": "If the green sphere were removed, would the red cylinder still start moving?",
        "answer": "yes",
        "choices": [
          "yes",
          "no"
        ],
        "answer_index": 0,
        "question_type": "counterfactual",
        "template": "cf_motion",
        "program": [
          {
            "op": "remove_object",
            "idx": 3
          },
          {
            "op": "filter_object",
            "idx": 0
          },
          {
            "op": "query_motion_start"
          }
        ]
      },
      {
        "question": "What material is the brown cube made of?",
        "answer": "rubber",
        "choices": [
          "rubber",
          "metal"
        ],
        "answer_index": 0,
        "question_type": "descriptive",
        "template": "query_material",
        "program": [
          {
            "op": "filter_color",
            "value": "brown"
          },
          {
            "op": "filter_shape",
            "value": "cube"
          },
          {
            "op": "query_material"
          }
        ]
      },
      {
        "question": "What happened right before the red cylinder collided with the brown cube?",
        "answer": "nothing happened",
        "choices": [
          "the brown cube collided with the wall",
          "the gray sphere collided with the wall",
          "nothing happened",
          "the red cylinder collided with the gray sphere"
        ],
        "answer_index": 2,
        "question_type": "explanatory",
        "template": "what_happened_before",
        "program": [
          {
            "op": "find_collision",
            "objects": [
              0,
              1
            ]
          },
          {
            "op": "query_before_event"
          }
        ]
      }
    ]
  },
  {
    "video_index": 6,
    "video_filename": "videos/video_00006.gif",
    "num_frames": 64,
    "frame_size": 128,
    "fps": 25,
    "scene": {
      "objects": [
        {
          "idx": 0,
          "color": "gray",
          "shape": "cylinder",
          "material": "metal",
          "size": "large",
          "radius": 0.30582561130513064,
          "position": [
            1.015313310209694,
            1.530768557963947
          ],
          "velocity": [
            0.9319215143021138,
            1.3700450324185096
          ],
          "spin": 1.4610128175207322,
          "is_probe": false
        },
        {
          "idx": 1,
          "color": "green",
          "shape": "cube",
          "material": "rubber",
          "size": "small",
          "radius": 0.15881747166108884,
          "position": [
            1.0384166676550775,
            -1.366283580995418
          ],
          "velocity": [
            -0.13504772072375007,
            1.651824808022114
          ],
          "spin": -0.8753456925925228,
          "is_probe": false
        },
        {
          "idx": 2,
          "color": "yellow",
          "shape": "sphere",
          "material": "rubber",
          "size": "small",
          "radius": 0.18688395948884723,
          "position": [
            1.1539508850452902,
            -0.025816298556336603
          ],
          "velocity": [
            1.2339526958730866,
            0.7270782658906909
          ],
          "spin": 0.9492184377530788,
          "is_probe": false
        }
      ]
    },
    "events": {
      "collision_events": [
        {
          "frame": 18,
          "objects": [
            0,
            2
          ],
          "description": "the gray cylinder collided with the yellow sphere"
        },
        {
          "frame": 30,
          "objects": [
            0,
            1
          ],
          "description": "the gray cylinder collided with the green cube"
        }
      ],
      "motion_events": [],
      "initially_moving": [
        0,
        1,
        2
      ]
    },
    "raw_events": {
      "collisions": [
        {
          "frame": 18,
          "objects": [
            0,
            2
          ]
        },
        {
          "frame": 30,
          "objects": [
            0,
            1
          ]
        }
      ],
      "starts": {
        "0": [],
        "1": [],
        "2": []
      },
      "stops": {
        "0": [],
        "1": [],
        "2": []
      },
      "initially_moving": [
        0,
        1,
        2
      ],
      "wall_hits": [
        [
          2,
          0,
          1,
          1
        ],
        [
          13,
          2,
          0,
          1
        ],
        [
          18,
          0,
          0,
          1
        ],
        [
          46,
          2,
          1,
          -1
        ]
      ]
    },
    "questions": [
      {
        "question": "If the yellow sphere were removed, would the gray cylinder still collide with the green cube?",
        "answer": "no",
        "choices": [
          "yes",
          "no"
        ],
        "answer_index": 1,
        "question_type": "counterfactual",
        "template": "cf_collision",
        "program": [
          {
            "op": "remove_object",
            "idx": 2
          },
          {
            "op": "find_collision",
            "objects": [
              0,
              1
            ]
          },
          {
            "op": "query_existence"
          }
        ]
      },
      {
        "question": "After the gray cylinder collided with the yellow sphere, will the gray cylinder collide with something else?",
        "answer": "yes",
        "choices": [
          "yes",
          "no"
        ],
        "answer_index": 0,
        "question_type": "predictive",
        "template": "will_collide_again",
        "program": [
          {
            "op": "find_collision",
            "objects": [
              0,
              2
            ]
          },
          {
            "op": "query_subsequent_collision"
          }
        ]
      },
      {
        "question": "How many yellow objects are there?",
        "answer": "1",
        "choices": [
          "0",
          "1",
          "3",
          "4",
          "5",
          "6"
        ],
        "answer_index": 1,
        "question_type": "descriptive",
        "template": "count_color",
        "program": [
          {
            "op": "filter_color",
            "value": "yellow"
          },
          {
            "op": "count"
          }
        ]
      },
      {
        "question": "If the green cube were removed, would the gray cylinder still collide with the yellow sphere?",
        "answer": "yes",
        "choices": [
          "yes",
          "no"
        ],
        "answer_index": 0,
        "question_type": "counterfactual",
        "template": "cf_collision",
        "program": [
          {
            "op": "remove_object",
            "idx": 1
          },
          {
            "op": "find_collision",
            "objects": [
              0,
              2
            ]
          },
          {
            "op": "query_existence"
          }
        ]
      },
      {
        "question": "What color is the sphere?",
        "answer": "yellow",
        "choices": [
          "yellow",
          "blue",
          "purple",
          "brown",
          "red",
          "gray",
          "cyan",
          "green"
        ],
        "answer_index": 0,
        "question_type": "descriptive",
        "template": "query_color",
        "program": [
          {
            "op": "filter_shape",
            "value": "sphere"
          },
          {
            "op": "query_color"
          }
        ]
      },
      {
        "question": "How many objects were moving when the gray cylinder collided with the green cube?",
        "answer": "3",
        "choices": [
          "0",
          "1",
          "2",
          "3"
        ],
        "answer_index": 3,
        "question_type": "explanatory",
        "template": "count_moving_at",
        "program": [
          {
            "op": "find_collision",
            "objects": [
              0,
              1
            ]
          },
          {
            "op": "count_moving_at_collision"
          }
        ]
      },
      {
        "question": "What material is the gray cylinder made of?",
        "answer": "metal",
        "choices": [
          "rubber",
          "metal"
        ],
        "answer_index": 1,
        "question_type": "descriptive",
        "template": "query_material",
        "program": [
          {
            "op": "filter_color",
            "value": "gray"
          },
          {
            "op": "filter_shape",
            "value": "cylinder"
          },
          {
            "op": "query_material"
          }
        ]
      },
      {
        "question": "What happened right after the gray cylinder collided with the green cube?",
        "answer": "nothing happened",
        "choices": [
          "the gray cylinder collided with the wall",
          "the yellow sphere collided with the wall",
          "the gray cylinder collided with the yellow sphere",
          "nothing happened"
        ],
        "answer_index": 3,
        "question_type": "explanatory",
        "template": "what_happened_after",
        "program": [
          {
            "op": "find_collision",
            "objects": [
              0,
              1
            ]
          },
          {
            "op": "query_after_event"
          }
        ]
      }
    ]
  },
  {
    "video_index": 7,
    "video_filename": "videos/video_00007.gif",
    "num_frames": 64,
    "frame_size": 128,
    "fps": 25,
    "scene": {
      "objects": [
        {
          "idx": 0,
          "color": "green",
          "shape": "sphere",
          "material": "metal",
          "size": "small",
          "radius": 0.16276677029301875,
          "position": [
            0.42778940044382985,
            0.5469957558196439
          ],
          "velocity": [
            -0.435788272762294,
            -0.708289098056274
          ],
          "spin": 1.0352229626236586,
          "is_probe": false
        },
        {
          "idx": 1,
          "color": "gray",
          "shape": "sphere",
          "material": "rubber",
          "size": "small",
          "radius": 0.19872487306467332,
          "position": [
            -1.0825571405780572,
            -0.18502825171661863
          ],
          "velocity": [
            0.0,
            0.0
          ],
          "spin": 1.3348445134349385,
          "is_probe": false
        },
        {
          "idx": 2,
          "color": "red",
          "shape": "cube",
          "material": "metal",
          "size": "small",
          "radius": 0.17539950158063664,
          "position": [
            -1.2502173088115887,
            1.4502669582513465
          ],
          "velocity": [
            0.0,
            0.0
          ],
          "spin": 1.2117503645877803,
          "is_probe": false
        },
        {
          "idx": 3,
          "color": "purple",
          "shape": "cube",
          "material": "rubber",
          "size": "large",
          "radius": 0.3084045003063881,
          "position": [
            -0.8834874841967719,
            0.5324720040949835
          ],
          "velocity": [
            -0.7656290826407781,
            -0.358628834908836
          ],
          "spin": -0.9226095150950029,
          "is_probe": false
        }
      ]
    },
    "events": {
      "collision_events": [
        {
          "frame": 34,
          "objects": [
            1,
            3
          ],
          "description": "the gray sphere collided with the purple cube"
        },
        {
          "frame": 50,
          "objects": [
            0,
            1
          ],
          "description": "the green sphere collided with the gray sphere"
        }
      ],
      "motion_events": [
        {
          "object": 1,
          "type": "start",
          "frame": 34,
          "cause_collision": {
            "frame": 34,
            "objects": [
              1,
              3
            ]
          }
        }
      ],
      "initially_moving": [
        0,
        3
      ]
    },
    "raw_events": {
      "collisions": [
        {
          "frame": 34,
          "objects": [
            1,
            3
          ]
        },
        {
          "frame": 50,
          "objects": [
            0,
            1
          ]
        }
      ],
      "starts": {
        "0": [],
        "1": [
          34
        ],
        "2": [],
        "3": []
      },
      "stops": {
        "0": [],
        "1": [],
        "2": [],
        "3": []
      },
      "initially_moving": [
        0,
        3
      ],
      "wall_hits": [
        [
          27,
          3,
          0,
          -1
        ]
      ]
    },
    "questions": [
      {
        "question": "If the purple cube were removed, would the gray sphere still start moving?",
        "answer": "no",
        "choices": [
          "no",
          "yes"
        ],
        "answer_index": 0,
        "question_type": "counterfactual",
        "template": "cf_motion",
        "program": [
          {
            "op": "remove_object",
            "idx": 3
          },
          {
            "op": "filter_object",
            "idx": 1
          },
          {
            "op": "query_motion_start"
          }
        ]
      },
      {
        "question": "What happened right after the gray sphere collided with the purple cube?",
        "answer": "the green sphere collided with the gray sphere",
        "choices": [
          "the green sphere collided with the gray sphere",
          "the purple cube collided with the wall",
          "the gray sphere started moving",
          "nothing happened"
        ],
        "answer_index": 0,
        "question_type": "explanatory",
        "template": "what_happened_after",
        "program": [
          {
            "op": "find_collision",
            "objects": [
              1,
              3
            ]
          },
          {
            "op": "query_after_event"
          }
        ]
      },
      {
        "question": "How many red objects are there?",
        "answer": "1",
        "choices": [
          "0",
          "1",
          "2",
          "4",
          "5",
          "6"
        ],
        "answer_index": 1,
        "question_type": "descriptive",
        "template": "count_color",
        "program": [
          {
            "op": "filter_color",
            "value": "red"
          },
          {
            "op": "count"
          }
        ]
      },
      {
        "question": "If the red cube were removed, would the gray sphere still collide with the purple cube?",
        "answer": "yes",
        "choices": [
          "yes",
          "no"
        ],
        "answer_index": 0,
        "question_type": "counterfactual",
        "template": "cf_collision",
        "program": [
          {
            "op": "remove_object",
            "idx": 2
          },
          {
            "op": "find_collision",
            "objects": [
              1,
              3
            ]
          },
          {
            "op": "query_existence"
          }
        ]
      },
      {
        "question": "What color is the object in front of the purple cube?",
        "answer": "gray",
        "choices": [
          "gray",
          "red",
          "blue",
          "cyan",
          "purple",
          "green",
          "yellow",
          "brown"
        ],
        "answer_index": 0,
        "question_type": "descriptive",
        "template": "query_color_rel",
        "program": [
          {
            "op": "filter_color",
            "value": "purple"
          },
          {
            "op": "relate",
            "direction": "in_front_of"
          },
          {
            "op": "query_color"
          }
        ]
      },
      {
        "question": "How many cube objects are there?",
        "answer": "2",
        "choices": [
          "1",
          "2",
          "3",
          "4",
          "5",
          "6"
        ],
        "answer_index": 1,
        "question_type": "descriptive",
        "template": "count_shape",
        "program": [
          {
            "op": "filter_shape",
            "value": "cube"
          },
          {
            "op": "count"
          }
        ]
      },
      {
        "question": "How many collisions happened in the video?",
        "answer": "2",
        "choices": [
          "0",
          "1",
          "2",
          "3",
          "4",
          "6"
        ],
        "answer_index": 2,
        "question_type": "explanatory",
        "template": "count_collisions",
        "program": [
          {
            "op": "filter_event",
            "type": "collision"
          },
          {
            "op": "count"
          }
        ]
      },
      {
        "question": "Will the gray sphere collide with the red cube by the end of the video?",
        "answer": "no",
        "choices": [
          "no",
          "yes"
        ],
        "answer_index": 0,
        "question_type": "predictive",
        "template": "will_collide",
        "program": [
          {
            "op": "find_collision",
            "objects": [
              1,
              2
            ]
          },
          {
            "op": "query_existence"
          }
        ]
      }
    ]
  }
]