{"subtask_index": 0, "subtask": "End."}
{"subtask_index": 1, "subtask": "Pick up the cube."}
{"subtask_index": 2, "subtask": "Grasp the cube."}
{"subtask_index": 3, "subtask": "Place cube into the cube recess."}
{"subtask_index": 4, "subtask": "Place cube into the cube-shaped recess."}
{"subtask_index": 5, "subtask": "null."}