{
 "schema_version": 1,
 "source": "vendor annotation.json (schema 2, revision 1)",
 "time_reference": "start_s / end_s: seconds from the start of the segment video, [start, end); t_start / t_end: the same bounds on the session time base (meta.json time_base, t = 0 at the first solved Body0 frame) = start_s + video_t_start",
 "primitive": "P39",
 "instruction": "Walk backward several steps, then turn while still moving backward, then continue backward. Operator confirms the space behind you is clear.",
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 ],
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   "instruction": "Walk backward several steps, then turn while still moving backward, then continue backward. Operator confirms the space behind you is clear."
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}