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  "canvas": {
    "width": 832,
    "height": 480
  },
  "instructions": "Rigidly move all seven pieces (translation + rotation; the parallelogram may also be reflected) so that together they exactly tile target_silhouette without overlaps. Report each piece's final pose.",
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      "start_pose": {
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    {
      "piece_id": "medium_tri",
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      "vertices": [
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      "start_pose": {
        "reflect": false,
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    {
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    },
    {
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    },
    {
      "piece_id": "small_tri_2",
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      "vertices": [
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        "reflect": false,
        "rot_deg": 45.0,
        "tx": 771.0976786880893,
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}