[
  {
    "video_index": 0,
    "video_filename": "videos/video_00000.gif",
    "num_frames": 64,
    "frame_size": 128,
    "fps": 25,
    "scene": {
      "objects": [
        {
          "idx": 0,
          "color": "green",
          "shape": "sphere",
          "material": "metal",
          "size": "small",
          "radius": 0.17842001197571544,
          "position": [
            -1.2831097060758159,
            1.5288077338159394
          ],
          "velocity": [
            1.1371823363112574,
            -0.11074127183419899
          ],
          "spin": -0.5939286623808103,
          "is_probe": false
        },
        {
          "idx": 1,
          "color": "brown",
          "shape": "cylinder",
          "material": "metal",
          "size": "small",
          "radius": 0.154432119580624,
          "position": [
            -0.8708611043042649,
            0.054353195533162424
          ],
          "velocity": [
            0.0,
            0.0
          ],
          "spin": 0.11806818455827983,
          "is_probe": false
        },
        {
          "idx": 2,
          "color": "cyan",
          "shape": "cube",
          "material": "metal",
          "size": "small",
          "radius": 0.19868537328535812,
          "position": [
            0.8721745689170637,
            -1.3597977677396367
          ],
          "velocity": [
            -1.4882262414474734,
            -0.04543232351084633
          ],
          "spin": 1.030820521509165,
          "is_probe": false
        },
        {
          "idx": 3,
          "color": "gray",
          "shape": "cylinder",
          "material": "metal",
          "size": "large",
          "radius": 0.32575232189106446,
          "position": [
            -0.049645682448904216,
            1.2157209887264557
          ],
          "velocity": [
            0.0,
            0.0
          ],
          "spin": -1.1281667447008625,
          "is_probe": false
        },
        {
          "idx": 4,
          "color": "blue",
          "shape": "sphere",
          "material": "rubber",
          "size": "small",
          "radius": 0.16909070171130455,
          "position": [
            1.3628906433149324,
            0.5471300435364592
          ],
          "velocity": [
            -0.33766236838990094,
            1.286019909253896
          ],
          "spin": -0.9553850118896718,
          "is_probe": false
        }
      ]
    },
    "events": {
      "collision_events": [
        {
          "frame": 17,
          "objects": [
            0,
            3
          ],
          "description": "the green sphere collided with the gray cylinder"
        },
        {
          "frame": 43,
          "objects": [
            3,
            4
          ],
          "description": "the gray cylinder collided with the blue sphere"
        }
      ],
      "motion_events": [
        {
          "object": 3,
          "type": "start",
          "frame": 17,
          "cause_collision": {
            "frame": 17,
            "objects": [
              0,
              3
            ]
          }
        }
      ],
      "initially_moving": [
        0,
        2,
        4
      ]
    },
    "raw_events": {
      "collisions": [
        {
          "frame": 17,
          "objects": [
            0,
            3
          ]
        },
        {
          "frame": 43,
          "objects": [
            3,
            4
          ]
        }
      ],
      "starts": {
        "0": [],
        "1": [],
        "2": [],
        "3": [
          17
        ],
        "4": []
      },
      "stops": {
        "0": [],
        "1": [],
        "2": [],
        "3": [],
        "4": []
      },
      "initially_moving": [
        0,
        2,
        4
      ],
      "wall_hits": [
        [
          26,
          4,
          1,
          1
        ],
        [
          34,
          0,
          1,
          1
        ],
        [
          49,
          2,
          0,
          -1
        ]
      ]
    },
    "questions": [
      {
        "question": "If the green sphere were removed, would the gray cylinder still collide with the blue sphere?",
        "answer": "no",
        "choices": [
          "yes",
          "no"
        ],
        "answer_index": 1,
        "question_type": "counterfactual",
        "template": "cf_collision",
        "program": [
          {
            "op": "remove_object",
            "idx": 0
          },
          {
            "op": "find_collision",
            "objects": [
              3,
              4
            ]
          },
          {
            "op": "query_existence"
          }
        ]
      },
      {
        "question": "How many collisions happened in the video?",
        "answer": "2",
        "choices": [
          "0",
          "2",
          "3",
          "4",
          "5",
          "6"
        ],
        "answer_index": 1,
        "question_type": "explanatory",
        "template": "count_collisions",
        "program": [
          {
            "op": "filter_event",
            "type": "collision"
          },
          {
            "op": "count"
          }
        ]
      },
      {
        "question": "How many objects are there?",
        "answer": "5",
        "choices": [
          "0",
          "1",
          "2",
          "3",
          "4",
          "5"
        ],
        "answer_index": 5,
        "question_type": "descriptive",
        "template": "count_all",
        "program": [
          {
            "op": "count"
          }
        ]
      },
      {
        "question": "How many cyan 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": "cyan"
          },
          {
            "op": "count"
          }
        ]
      },
      {
        "question": "If the brown cylinder were removed, would the green sphere still collide with the gray cylinder?",
        "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,
              3
            ]
          },
          {
            "op": "query_existence"
          }
        ]
      },
      {
        "question": "Will the green sphere collide with the cyan cube 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,
              2
            ]
          },
          {
            "op": "query_existence"
          }
        ]
      },
      {
        "question": "What happened right after the green sphere collided with the gray cylinder?",
        "answer": "the gray cylinder collided with the blue sphere",
        "choices": [
          "the cyan cube collided with the wall",
          "the gray cylinder collided with the blue sphere",
          "the blue sphere collided with the wall",
          "the green sphere collided with the wall"
        ],
        "answer_index": 1,
        "question_type": "explanatory",
        "template": "what_happened_after",
        "program": [
          {
            "op": "find_collision",
            "objects": [
              0,
              3
            ]
          },
          {
            "op": "query_after_event"
          }
        ]
      },
      {
        "question": "What material is the gray cylinder made of?",
        "answer": "metal",
        "choices": [
          "metal",
          "rubber"
        ],
        "answer_index": 0,
        "question_type": "descriptive",
        "template": "query_material",
        "program": [
          {
            "op": "filter_color",
            "value": "gray"
          },
          {
            "op": "filter_shape",
            "value": "cylinder"
          },
          {
            "op": "query_material"
          }
        ]
      }
    ]
  },
  {
    "video_index": 1,
    "video_filename": "videos/video_00001.gif",
    "num_frames": 64,
    "frame_size": 128,
    "fps": 25,
    "scene": {
      "objects": [
        {
          "idx": 0,
          "color": "yellow",
          "shape": "sphere",
          "material": "rubber",
          "size": "small",
          "radius": 0.17194511077705654,
          "position": [
            0.5796384023853001,
            -1.0471068851015883
          ],
          "velocity": [
            -0.4951135576929051,
            0.5860746736244568
          ],
          "spin": -0.9543318844641451,
          "is_probe": false
        },
        {
          "idx": 1,
          "color": "gray",
          "shape": "cube",
          "material": "rubber",
          "size": "large",
          "radius": 0.27926592201093065,
          "position": [
            0.4218088731419638,
            -0.2710085277481875
          ],
          "velocity": [
            0.0,
            0.0
          ],
          "spin": -0.6868362200648936,
          "is_probe": false
        },
        {
          "idx": 2,
          "color": "red",
          "shape": "cylinder",
          "material": "rubber",
          "size": "small",
          "radius": 0.1438823708338223,
          "position": [
            -0.8144907872073245,
            1.034296218872339
          ],
          "velocity": [
            0.0,
            0.0
          ],
          "spin": -1.2493020228412863,
          "is_probe": false
        },
        {
          "idx": 3,
          "color": "green",
          "shape": "cube",
          "material": "rubber",
          "size": "small",
          "radius": 0.1447590419189412,
          "position": [
            -0.5913193846125204,
            0.5041660293584826
          ],
          "velocity": [
            0.0,
            0.0
          ],
          "spin": -1.1836896724488324,
          "is_probe": false
        },
        {
          "idx": 4,
          "color": "blue",
          "shape": "cylinder",
          "material": "rubber",
          "size": "large",
          "radius": 0.26006196040065005,
          "position": [
            -0.19293347948416484,
            -1.1616843963130732
          ],
          "velocity": [
            -0.41415738673125596,
            1.5975746335488124
          ],
          "spin": -1.073993869404907,
          "is_probe": false
        }
      ]
    },
    "events": {
      "collision_events": [
        {
          "frame": 15,
          "objects": [
            0,
            1
          ],
          "description": "the yellow sphere collided with the gray cube"
        },
        {
          "frame": 20,
          "objects": [
            3,
            4
          ],
          "description": "the green cube collided with the blue cylinder"
        },
        {
          "frame": 24,
          "objects": [
            2,
            3
          ],
          "description": "the red cylinder collided with the green cube"
        }
      ],
      "motion_events": [
        {
          "object": 1,
          "type": "start",
          "frame": 15,
          "cause_collision": {
            "frame": 15,
            "objects": [
              0,
              1
            ]
          }
        },
        {
          "object": 2,
          "type": "start",
          "frame": 24,
          "cause_collision": {
            "frame": 24,
            "objects": [
              2,
              3
            ]
          }
        },
        {
          "object": 3,
          "type": "start",
          "frame": 20,
          "cause_collision": {
            "frame": 20,
            "objects": [
              3,
              4
            ]
          }
        }
      ],
      "initially_moving": [
        0,
        4
      ]
    },
    "raw_events": {
      "collisions": [
        {
          "frame": 15,
          "objects": [
            0,
            1
          ]
        },
        {
          "frame": 20,
          "objects": [
            3,
            4
          ]
        },
        {
          "frame": 24,
          "objects": [
            2,
            3
          ]
        }
      ],
      "starts": {
        "0": [],
        "1": [
          15
        ],
        "2": [
          24
        ],
        "3": [
          20
        ],
        "4": []
      },
      "stops": {
        "0": [],
        "1": [],
        "2": [],
        "3": [],
        "4": []
      },
      "initially_moving": [
        0,
        4
      ],
      "wall_hits": [
        [
          37,
          2,
          1,
          1
        ],
        [
          47,
          2,
          0,
          -1
        ]
      ]
    },
    "questions": [
      {
        "question": "If the yellow sphere were removed, would the red cylinder still collide with the green cube?",
        "answer": "yes",
        "choices": [
          "no",
          "yes"
        ],
        "answer_index": 1,
        "question_type": "counterfactual",
        "template": "cf_collision",
        "program": [
          {
            "op": "remove_object",
            "idx": 0
          },
          {
            "op": "find_collision",
            "objects": [
              2,
              3
            ]
          },
          {
            "op": "query_existence"
          }
        ]
      },
      {
        "question": "What happened right after the yellow sphere collided with the gray cube?",
        "answer": "the green cube collided with the blue cylinder",
        "choices": [
          "the red cylinder collided with the wall",
          "the green cube collided with the blue cylinder",
          "the red cylinder collided with the green cube",
          "the red cylinder started moving"
        ],
        "answer_index": 1,
        "question_type": "explanatory",
        "template": "what_happened_after",
        "program": [
          {
            "op": "find_collision",
            "objects": [
              0,
              1
            ]
          },
          {
            "op": "query_after_event"
          }
        ]
      },
      {
        "question": "How many objects are there?",
        "answer": "5",
        "choices": [
          "0",
          "1",
          "2",
          "4",
          "5",
          "6"
        ],
        "answer_index": 4,
        "question_type": "descriptive",
        "template": "count_all",
        "program": [
          {
            "op": "count"
          }
        ]
      },
      {
        "question": "What material is the yellow sphere made of?",
        "answer": "rubber",
        "choices": [
          "rubber",
          "metal"
        ],
        "answer_index": 0,
        "question_type": "descriptive",
        "template": "query_material",
        "program": [
          {
            "op": "filter_color",
            "value": "yellow"
          },
          {
            "op": "filter_shape",
            "value": "sphere"
          },
          {
            "op": "query_material"
          }
        ]
      },
      {
        "question": "If the blue cylinder were removed, would the red cylinder still collide with the green cube?",
        "answer": "no",
        "choices": [
          "no",
          "yes"
        ],
        "answer_index": 0,
        "question_type": "counterfactual",
        "template": "cf_collision",
        "program": [
          {
            "op": "remove_object",
            "idx": 4
          },
          {
            "op": "find_collision",
            "objects": [
              2,
              3
            ]
          },
          {
            "op": "query_existence"
          }
        ]
      },
      {
        "question": "How many collisions happened in the video?",
        "answer": "3",
        "choices": [
          "0",
          "2",
          "3",
          "4",
          "5",
          "6"
        ],
        "answer_index": 2,
        "question_type": "explanatory",
        "template": "count_collisions",
        "program": [
          {
            "op": "filter_event",
            "type": "collision"
          },
          {
            "op": "count"
          }
        ]
      },
      {
        "question": "What shape is the red object?",
        "answer": "cylinder",
        "choices": [
          "cube",
          "cylinder",
          "sphere"
        ],
        "answer_index": 1,
        "question_type": "descriptive",
        "template": "query_shape",
        "program": [
          {
            "op": "filter_color",
            "value": "red"
          },
          {
            "op": "query_shape"
          }
        ]
      },
      {
        "question": "After the green cube collided with the blue cylinder, will the green cube collide with something else?",
        "answer": "yes",
        "choices": [
          "yes",
          "no"
        ],
        "answer_index": 0,
        "question_type": "predictive",
        "template": "will_collide_again",
        "program": [
          {
            "op": "find_collision",
            "objects": [
              3,
              4
            ]
          },
          {
            "op": "query_subsequent_collision"
          }
        ]
      }
    ]
  },
  {
    "video_index": 2,
    "video_filename": "videos/video_00002.gif",
    "num_frames": 64,
    "frame_size": 128,
    "fps": 25,
    "scene": {
      "objects": [
        {
          "idx": 0,
          "color": "green",
          "shape": "cylinder",
          "material": "rubber",
          "size": "large",
          "radius": 0.2671369516764458,
          "position": [
            -0.8819517402395182,
            1.2867540872990217
          ],
          "velocity": [
            0.20425879685480974,
            -1.0761339015142637
          ],
          "spin": -1.0366489856614496,
          "is_probe": false
        },
        {
          "idx": 1,
          "color": "gray",
          "shape": "cylinder",
          "material": "rubber",
          "size": "small",
          "radius": 0.1421069078249453,
          "position": [
            -0.9860567941452067,
            -0.20730587719521054
          ],
          "velocity": [
            0.0,
            0.0
          ],
          "spin": 0.5177516767984613,
          "is_probe": false
        },
        {
          "idx": 2,
          "color": "purple",
          "shape": "cylinder",
          "material": "metal",
          "size": "small",
          "radius": 0.14580005751436406,
          "position": [
            0.43376748327964165,
            0.38471635297408313
          ],
          "velocity": [
            -1.321944719132612,
            -0.33669199770755437
          ],
          "spin": -0.8457837324623861,
          "is_probe": false
        },
        {
          "idx": 3,
          "color": "blue",
          "shape": "sphere",
          "material": "metal",
          "size": "small",
          "radius": 0.17144959321973907,
          "position": [
            -0.9144942291227166,
            -0.9397851828534602
          ],
          "velocity": [
            -0.09523747360122295,
            1.0171860809833726
          ],
          "spin": 1.031638460826092,
          "is_probe": false
        },
        {
          "idx": 4,
          "color": "brown",
          "shape": "sphere",
          "material": "rubber",
          "size": "small",
          "radius": 0.17795025156168076,
          "position": [
            1.0496910561894988,
            -1.0128425467875481
          ],
          "velocity": [
            0.0,
            0.0
          ],
          "spin": -0.6294061698231067,
          "is_probe": false
        }
      ]
    },
    "events": {
      "collision_events": [
        {
          "frame": 10,
          "objects": [
            1,
            3
          ],
          "description": "the gray cylinder collided with the blue sphere"
        },
        {
          "frame": 18,
          "objects": [
            0,
            1
          ],
          "description": "the green cylinder collided with the gray cylinder"
        },
        {
          "frame": 19,
          "objects": [
            0,
            2
          ],
          "description": "the green cylinder collided with the purple cylinder"
        },
        {
          "frame": 23,
          "objects": [
            2,
            3
          ],
          "description": "the purple cylinder collided with the blue sphere"
        }
      ],
      "motion_events": [
        {
          "object": 1,
          "type": "start",
          "frame": 10,
          "cause_collision": {
            "frame": 10,
            "objects": [
              1,
              3
            ]
          }
        }
      ],
      "initially_moving": [
        0,
        2,
        3
      ]
    },
    "raw_events": {
      "collisions": [
        {
          "frame": 10,
          "objects": [
            1,
            3
          ]
        },
        {
          "frame": 18,
          "objects": [
            0,
            1
          ]
        },
        {
          "frame": 19,
          "objects": [
            0,
            2
          ]
        },
        {
          "frame": 23,
          "objects": [
            2,
            3
          ]
        }
      ],
      "starts": {
        "0": [],
        "1": [
          10
        ],
        "2": [],
        "3": [],
        "4": []
      },
      "stops": {
        "0": [],
        "1": [],
        "2": [],
        "3": [],
        "4": []
      },
      "initially_moving": [
        0,
        2,
        3
      ],
      "wall_hits": [
        [
          30,
          1,
          0,
          -1
        ],
        [
          45,
          3,
          0,
          -1
        ]
      ]
    },
    "questions": [
      {
        "question": "If the purple cylinder were removed, would the gray cylinder still start moving?",
        "answer": "yes",
        "choices": [
          "yes",
          "no"
        ],
        "answer_index": 0,
        "question_type": "counterfactual",
        "template": "cf_motion",
        "program": [
          {
            "op": "remove_object",
            "idx": 2
          },
          {
            "op": "filter_object",
            "idx": 1
          },
          {
            "op": "query_motion_start"
          }
        ]
      },
      {
        "question": "Will the purple cylinder collide with the blue sphere 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": [
              2,
              3
            ]
          },
          {
            "op": "query_existence"
          }
        ]
      },
      {
        "question": "If the brown sphere were removed, would the gray cylinder still start moving?",
        "answer": "yes",
        "choices": [
          "no",
          "yes"
        ],
        "answer_index": 1,
        "question_type": "counterfactual",
        "template": "cf_motion",
        "program": [
          {
            "op": "remove_object",
            "idx": 4
          },
          {
            "op": "filter_object",
            "idx": 1
          },
          {
            "op": "query_motion_start"
          }
        ]
      },
      {
        "question": "What color is the object behind the purple cylinder?",
        "answer": "green",
        "choices": [
          "purple",
          "red",
          "brown",
          "yellow",
          "gray",
          "cyan",
          "blue",
          "green"
        ],
        "answer_index": 7,
        "question_type": "descriptive",
        "template": "query_color_rel",
        "program": [
          {
            "op": "filter_color",
            "value": "purple"
          },
          {
            "op": "relate",
            "direction": "behind"
          },
          {
            "op": "query_color"
          }
        ]
      },
      {
        "question": "How many collisions happened in the video?",
        "answer": "4",
        "choices": [
          "1",
          "2",
          "3",
          "4",
          "5",
          "6"
        ],
        "answer_index": 3,
        "question_type": "explanatory",
        "template": "count_collisions",
        "program": [
          {
            "op": "filter_event",
            "type": "collision"
          },
          {
            "op": "count"
          }
        ]
      },
      {
        "question": "How many rubber objects are there?",
        "answer": "3",
        "choices": [
          "1",
          "2",
          "3",
          "4",
          "5",
          "6"
        ],
        "answer_index": 2,
        "question_type": "descriptive",
        "template": "count_material",
        "program": [
          {
            "op": "filter_material",
            "value": "rubber"
          },
          {
            "op": "count"
          }
        ]
      },
      {
        "question": "What happened right before the green cylinder collided with the purple cylinder?",
        "answer": "the green cylinder collided with the gray cylinder",
        "choices": [
          "the gray cylinder collided with the blue sphere",
          "the green cylinder collided with the gray cylinder",
          "the blue sphere collided with the wall",
          "the gray cylinder collided with the wall"
        ],
        "answer_index": 1,
        "question_type": "explanatory",
        "template": "what_happened_before",
        "program": [
          {
            "op": "find_collision",
            "objects": [
              0,
              2
            ]
          },
          {
            "op": "query_before_event"
          }
        ]
      },
      {
        "question": "How many metal objects are there?",
        "answer": "2",
        "choices": [
          "0",
          "1",
          "2",
          "3",
          "4",
          "5"
        ],
        "answer_index": 2,
        "question_type": "descriptive",
        "template": "count_material",
        "program": [
          {
            "op": "filter_material",
            "value": "metal"
          },
          {
            "op": "count"
          }
        ]
      }
    ]
  },
  {
    "video_index": 3,
    "video_filename": "videos/video_00003.gif",
    "num_frames": 64,
    "frame_size": 128,
    "fps": 25,
    "scene": {
      "objects": [
        {
          "idx": 0,
          "color": "green",
          "shape": "sphere",
          "material": "metal",
          "size": "small",
          "radius": 0.19085985909319655,
          "position": [
            -1.4685318846561954,
            0.6839252395492907
          ],
          "velocity": [
            -1.5012803734515086,
            0.04895061953893949
          ],
          "spin": 1.2762174346429003,
          "is_probe": false
        },
        {
          "idx": 1,
          "color": "gray",
          "shape": "cylinder",
          "material": "metal",
          "size": "small",
          "radius": 0.1522940905161822,
          "position": [
            0.5752418008382836,
            0.7558888144938571
          ],
          "velocity": [
            -1.2670726686631102,
            -0.06153339003960453
          ],
          "spin": 0.5603151656491567,
          "is_probe": false
        },
        {
          "idx": 2,
          "color": "purple",
          "shape": "sphere",
          "material": "metal",
          "size": "small",
          "radius": 0.1975906316014229,
          "position": [
            0.7590047987434374,
            -0.6973025188600902
          ],
          "velocity": [
            -0.719946505105959,
            0.5721720011698309
          ],
          "spin": 0.7491642485674976,
          "is_probe": false
        },
        {
          "idx": 3,
          "color": "yellow",
          "shape": "cube",
          "material": "metal",
          "size": "small",
          "radius": 0.16927309984738334,
          "position": [
            -0.2855083313941338,
            -0.8084296967711194
          ],
          "velocity": [
            -0.2717168191053021,
            1.6377648394724293
          ],
          "spin": 1.3579646543150146,
          "is_probe": false
        }
      ]
    },
    "events": {
      "collision_events": [
        {
          "frame": 19,
          "objects": [
            1,
            3
          ],
          "description": "the gray cylinder collided with the yellow cube"
        },
        {
          "frame": 24,
          "objects": [
            0,
            3
          ],
          "description": "the green sphere collided with the yellow cube"
        },
        {
          "frame": 57,
          "objects": [
            1,
            2
          ],
          "description": "the gray cylinder collided with the purple sphere"
        }
      ],
      "motion_events": [],
      "initially_moving": [
        0,
        1,
        2,
        3
      ]
    },
    "raw_events": {
      "collisions": [
        {
          "frame": 19,
          "objects": [
            1,
            3
          ]
        },
        {
          "frame": 24,
          "objects": [
            0,
            3
          ]
        },
        {
          "frame": 57,
          "objects": [
            1,
            2
          ]
        }
      ],
      "starts": {
        "0": [],
        "1": [],
        "2": [],
        "3": []
      },
      "stops": {
        "0": [],
        "1": [],
        "2": [
          57
        ],
        "3": []
      },
      "initially_moving": [
        0,
        1,
        2,
        3
      ],
      "wall_hits": [
        [
          5,
          0,
          0,
          -1
        ],
        [
          36,
          1,
          1,
          1
        ],
        [
          60,
          0,
          1,
          1
        ]
      ]
    },
    "questions": [
      {
        "question": "What happened right before the green sphere collided with the yellow cube?",
        "answer": "the gray cylinder collided with the yellow cube",
        "choices": [
          "the gray cylinder collided with the wall",
          "the gray cylinder collided with the yellow cube",
          "the green sphere collided with the wall",
          "nothing happened"
        ],
        "answer_index": 1,
        "question_type": "explanatory",
        "template": "what_happened_before",
        "program": [
          {
            "op": "find_collision",
            "objects": [
              0,
              3
            ]
          },
          {
            "op": "query_before_event"
          }
        ]
      },
      {
        "question": "If the purple sphere were removed, would the green sphere 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": 2
          },
          {
            "op": "find_collision",
            "objects": [
              0,
              3
            ]
          },
          {
            "op": "query_existence"
          }
        ]
      },
      {
        "question": "How many green 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": "green"
          },
          {
            "op": "count"
          }
        ]
      },
      {
        "question": "How many sphere objects are there?",
        "answer": "2",
        "choices": [
          "0",
          "1",
          "2",
          "3",
          "4",
          "6"
        ],
        "answer_index": 2,
        "question_type": "descriptive",
        "template": "count_shape",
        "program": [
          {
            "op": "filter_shape",
            "value": "sphere"
          },
          {
            "op": "count"
          }
        ]
      },
      {
        "question": "Will the gray cylinder collide with the purple 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": [
              1,
              2
            ]
          },
          {
            "op": "query_existence"
          }
        ]
      },
      {
        "question": "How many objects were moving when the green sphere collided with the yellow cube?",
        "answer": "4",
        "choices": [
          "0",
          "1",
          "2",
          "3",
          "4"
        ],
        "answer_index": 4,
        "question_type": "explanatory",
        "template": "count_moving_at",
        "program": [
          {
            "op": "find_collision",
            "objects": [
              0,
              3
            ]
          },
          {
            "op": "count_moving_at_collision"
          }
        ]
      },
      {
        "question": "If the purple sphere were removed, would the gray cylinder still collide with the yellow cube?",
        "answer": "yes",
        "choices": [
          "no",
          "yes"
        ],
        "answer_index": 1,
        "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 cylinder?",
        "answer": "gray",
        "choices": [
          "purple",
          "green",
          "gray",
          "brown",
          "yellow",
          "red",
          "cyan",
          "blue"
        ],
        "answer_index": 2,
        "question_type": "descriptive",
        "template": "query_color",
        "program": [
          {
            "op": "filter_shape",
            "value": "cylinder"
          },
          {
            "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": "cube",
          "material": "rubber",
          "size": "large",
          "radius": 0.2687185426571089,
          "position": [
            -1.0042108580877231,
            0.14071961358691176
          ],
          "velocity": [
            0.0,
            0.0
          ],
          "spin": 1.2568453724186748,
          "is_probe": false
        },
        {
          "idx": 1,
          "color": "blue",
          "shape": "sphere",
          "material": "rubber",
          "size": "large",
          "radius": 0.276438709218918,
          "position": [
            0.24789874469824347,
            0.5415941333323582
          ],
          "velocity": [
            0.0,
            0.0
          ],
          "spin": -1.1294198021195976,
          "is_probe": false
        },
        {
          "idx": 2,
          "color": "brown",
          "shape": "cube",
          "material": "metal",
          "size": "small",
          "radius": 0.15214322790465903,
          "position": [
            0.7191892360319618,
            -0.24228887700128965
          ],
          "velocity": [
            0.0,
            0.0
          ],
          "spin": -1.0083550552298082,
          "is_probe": false
        },
        {
          "idx": 3,
          "color": "gray",
          "shape": "sphere",
          "material": "metal",
          "size": "small",
          "radius": 0.15257314525758128,
          "position": [
            1.4783863928722398,
            0.06952797106628061
          ],
          "velocity": [
            -1.1201438372382773,
            -0.9338284803080776
          ],
          "spin": 0.4203376074696228,
          "is_probe": false
        },
        {
          "idx": 4,
          "color": "cyan",
          "shape": "cube",
          "material": "metal",
          "size": "small",
          "radius": 0.17210005146997123,
          "position": [
            -0.23955287228925748,
            1.5323973260503172
          ],
          "velocity": [
            -0.5641199733880975,
            1.5406646466961555
          ],
          "spin": 0.6164386232065584,
          "is_probe": false
        }
      ]
    },
    "events": {
      "collision_events": [
        {
          "frame": 10,
          "objects": [
            2,
            3
          ],
          "description": "the brown cube collided with the gray sphere"
        },
        {
          "frame": 29,
          "objects": [
            0,
            4
          ],
          "description": "the red cube collided with the cyan cube"
        }
      ],
      "motion_events": [
        {
          "object": 0,
          "type": "start",
          "frame": 29,
          "cause_collision": {
            "frame": 29,
            "objects": [
              0,
              4
            ]
          }
        },
        {
          "object": 2,
          "type": "start",
          "frame": 10,
          "cause_collision": {
            "frame": 10,
            "objects": [
              2,
              3
            ]
          }
        }
      ],
      "initially_moving": [
        3,
        4
      ]
    },
    "raw_events": {
      "collisions": [
        {
          "frame": 10,
          "objects": [
            2,
            3
          ]
        },
        {
          "frame": 29,
          "objects": [
            0,
            4
          ]
        }
      ],
      "starts": {
        "0": [
          29
        ],
        "1": [],
        "2": [
          10
        ],
        "3": [],
        "4": []
      },
      "stops": {
        "0": [],
        "1": [],
        "2": [],
        "3": [],
        "4": [
          29
        ]
      },
      "initially_moving": [
        3,
        4
      ],
      "wall_hits": [
        [
          4,
          4,
          1,
          1
        ],
        [
          48,
          3,
          1,
          -1
        ]
      ]
    },
    "questions": [
      {
        "question": "What happened right after the brown cube collided with the gray sphere?",
        "answer": "the red cube collided with the cyan cube",
        "choices": [
          "nothing happened",
          "the red cube collided with the cyan cube",
          "the cyan cube collided with the wall",
          "the brown cube started moving"
        ],
        "answer_index": 1,
        "question_type": "explanatory",
        "template": "what_happened_after",
        "program": [
          {
            "op": "find_collision",
            "objects": [
              2,
              3
            ]
          },
          {
            "op": "query_after_event"
          }
        ]
      },
      {
        "question": "What happened right before the red cube collided with the cyan cube?",
        "answer": "the brown cube collided with the gray sphere",
        "choices": [
          "the brown cube started moving",
          "the gray sphere collided with the wall",
          "the brown cube collided with the gray sphere",
          "the red cube started moving"
        ],
        "answer_index": 2,
        "question_type": "explanatory",
        "template": "what_happened_before",
        "program": [
          {
            "op": "find_collision",
            "objects": [
              0,
              4
            ]
          },
          {
            "op": "query_before_event"
          }
        ]
      },
      {
        "question": "After the brown cube collided with the gray sphere, will the brown 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": "If the blue sphere were removed, would the brown cube 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": 1
          },
          {
            "op": "find_collision",
            "objects": [
              2,
              3
            ]
          },
          {
            "op": "query_existence"
          }
        ]
      },
      {
        "question": "What color is the object left of the blue sphere?",
        "answer": "red",
        "choices": [
          "yellow",
          "blue",
          "purple",
          "gray",
          "red",
          "cyan",
          "brown",
          "green"
        ],
        "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": "What material is the cyan cube made of?",
        "answer": "metal",
        "choices": [
          "rubber",
          "metal"
        ],
        "answer_index": 1,
        "question_type": "descriptive",
        "template": "query_material",
        "program": [
          {
            "op": "filter_color",
            "value": "cyan"
          },
          {
            "op": "filter_shape",
            "value": "cube"
          },
          {
            "op": "query_material"
          }
        ]
      },
      {
        "question": "If the gray sphere were removed, would the red cube 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": 0
          },
          {
            "op": "query_motion_start"
          }
        ]
      },
      {
        "question": "What color is the object behind the blue sphere?",
        "answer": "cyan",
        "choices": [
          "yellow",
          "gray",
          "green",
          "blue",
          "red",
          "brown",
          "cyan",
          "purple"
        ],
        "answer_index": 6,
        "question_type": "descriptive",
        "template": "query_color_rel",
        "program": [
          {
            "op": "filter_color",
            "value": "blue"
          },
          {
            "op": "relate",
            "direction": "behind"
          },
          {
            "op": "query_color"
          }
        ]
      }
    ]
  },
  {
    "video_index": 5,
    "video_filename": "videos/video_00005.gif",
    "num_frames": 64,
    "frame_size": 128,
    "fps": 25,
    "scene": {
      "objects": [
        {
          "idx": 0,
          "color": "cyan",
          "shape": "cube",
          "material": "rubber",
          "size": "small",
          "radius": 0.19138711777661502,
          "position": [
            0.44545785178566155,
            1.106707110817401
          ],
          "velocity": [
            0.0,
            0.0
          ],
          "spin": 1.4349981853321045,
          "is_probe": false
        },
        {
          "idx": 1,
          "color": "yellow",
          "shape": "cube",
          "material": "rubber",
          "size": "large",
          "radius": 0.3319841220957937,
          "position": [
            -0.9941523293346598,
            -0.368084890349631
          ],
          "velocity": [
            0.6989804924915608,
            0.3080716645940766
          ],
          "spin": 1.1940520225764595,
          "is_probe": false
        },
        {
          "idx": 2,
          "color": "blue",
          "shape": "cube",
          "material": "rubber",
          "size": "large",
          "radius": 0.3352222128598705,
          "position": [
            -0.0641559351151475,
            -0.6188884240280297
          ],
          "velocity": [
            -0.37582567398611605,
            0.6086788097463455
          ],
          "spin": 0.3656054513786171,
          "is_probe": false
        },
        {
          "idx": 3,
          "color": "purple",
          "shape": "sphere",
          "material": "metal",
          "size": "large",
          "radius": 0.29517770729696136,
          "position": [
            -0.37760581713592933,
            -1.492925254422702
          ],
          "velocity": [
            0.0,
            0.0
          ],
          "spin": 1.4267790982768842,
          "is_probe": false
        },
        {
          "idx": 4,
          "color": "red",
          "shape": "sphere",
          "material": "metal",
          "size": "small",
          "radius": 0.15491085651499883,
          "position": [
            -0.17459392911703175,
            0.4495987495804026
          ],
          "velocity": [
            -0.4179262149507641,
            1.1366455963762732
          ],
          "spin": 1.4159802579610448,
          "is_probe": false
        }
      ]
    },
    "events": {
      "collision_events": [
        {
          "frame": 6,
          "objects": [
            1,
            2
          ],
          "description": "the yellow cube collided with the blue cube"
        },
        {
          "frame": 57,
          "objects": [
            1,
            4
          ],
          "description": "the yellow cube collided with the red sphere"
        }
      ],
      "motion_events": [],
      "initially_moving": [
        1,
        2,
        4
      ]
    },
    "raw_events": {
      "collisions": [
        {
          "frame": 6,
          "objects": [
            1,
            2
          ]
        },
        {
          "frame": 57,
          "objects": [
            1,
            4
          ]
        }
      ],
      "starts": {
        "0": [],
        "1": [],
        "2": [],
        "3": [],
        "4": []
      },
      "stops": {
        "0": [],
        "1": [],
        "2": [],
        "3": [],
        "4": []
      },
      "initially_moving": [
        1,
        2,
        4
      ],
      "wall_hits": [
        [
          32,
          4,
          1,
          1
        ]
      ]
    },
    "questions": [
      {
        "question": "How many objects were moving when the yellow cube collided with the red sphere?",
        "answer": "3",
        "choices": [
          "0",
          "1",
          "2",
          "3",
          "4",
          "5"
        ],
        "answer_index": 3,
        "question_type": "explanatory",
        "template": "count_moving_at",
        "program": [
          {
            "op": "find_collision",
            "objects": [
              1,
              4
            ]
          },
          {
            "op": "count_moving_at_collision"
          }
        ]
      },
      {
        "question": "What shape is the blue object?",
        "answer": "cube",
        "choices": [
          "cylinder",
          "cube",
          "sphere"
        ],
        "answer_index": 1,
        "question_type": "descriptive",
        "template": "query_shape",
        "program": [
          {
            "op": "filter_color",
            "value": "blue"
          },
          {
            "op": "query_shape"
          }
        ]
      },
      {
        "question": "Will the cyan cube collide with the purple sphere 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": [
              0,
              3
            ]
          },
          {
            "op": "query_existence"
          }
        ]
      },
      {
        "question": "If the cyan cube were removed, would the yellow cube still collide with the red sphere?",
        "answer": "yes",
        "choices": [
          "yes",
          "no"
        ],
        "answer_index": 0,
        "question_type": "counterfactual",
        "template": "cf_collision",
        "program": [
          {
            "op": "remove_object",
            "idx": 0
          },
          {
            "op": "find_collision",
            "objects": [
              1,
              4
            ]
          },
          {
            "op": "query_existence"
          }
        ]
      },
      {
        "question": "If the purple sphere were removed, would the yellow cube still collide with the blue cube?",
        "answer": "yes",
        "choices": [
          "no",
          "yes"
        ],
        "answer_index": 1,
        "question_type": "counterfactual",
        "template": "cf_collision",
        "program": [
          {
            "op": "remove_object",
            "idx": 3
          },
          {
            "op": "find_collision",
            "objects": [
              1,
              2
            ]
          },
          {
            "op": "query_existence"
          }
        ]
      },
      {
        "question": "How many sphere objects are there?",
        "answer": "2",
        "choices": [
          "0",
          "2",
          "3",
          "4",
          "5",
          "6"
        ],
        "answer_index": 1,
        "question_type": "descriptive",
        "template": "count_shape",
        "program": [
          {
            "op": "filter_shape",
            "value": "sphere"
          },
          {
            "op": "count"
          }
        ]
      },
      {
        "question": "What color is the object behind the red sphere?",
        "answer": "cyan",
        "choices": [
          "green",
          "purple",
          "blue",
          "yellow",
          "brown",
          "gray",
          "cyan",
          "red"
        ],
        "answer_index": 6,
        "question_type": "descriptive",
        "template": "query_color_rel",
        "program": [
          {
            "op": "filter_color",
            "value": "red"
          },
          {
            "op": "relate",
            "direction": "behind"
          },
          {
            "op": "query_color"
          }
        ]
      },
      {
        "question": "How many collisions happened in the video?",
        "answer": "2",
        "choices": [
          "0",
          "1",
          "2",
          "4",
          "5",
          "6"
        ],
        "answer_index": 2,
        "question_type": "explanatory",
        "template": "count_collisions",
        "program": [
          {
            "op": "filter_event",
            "type": "collision"
          },
          {
            "op": "count"
          }
        ]
      }
    ]
  }
]