{
  "step": "C464",
  "control": "Temporarily discard SP companion labels; all original results remain unchanged.",
  "removed_coordinate_list": [
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    2392,
    2394,
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    3709,
    3765,
    3767,
    3769,
    3835,
    3837,
    3839,
    3895,
    3897,
    3899
  ],
  "witness_tests": [
    {
      "witness": "first_interval_ladder",
      "required_coordinates": [
        3620,
        1895,
        2953,
        1745,
        2895
      ],
      "missing_coordinates": [
        3620
      ],
      "survives": false
    },
    {
      "witness": "complete_two_E_ladder",
      "required_coordinates": [
        3620,
        2756,
        2148,
        3206,
        2020,
        3170,
        1956
      ],
      "missing_coordinates": [
        3620
      ],
      "survives": false
    },
    {
      "witness": "ordinary_reflection_cycle",
      "required_coordinates": [
        2610,
        3766,
        2730,
        3770,
        3188,
        3248,
        3250,
        3190
      ],
      "missing_coordinates": [
        2730
      ],
      "survives": false
    },
    {
      "witness": "mixed_cycle",
      "required_coordinates": [
        2731,
        3765,
        2735,
        2733,
        3248,
        3250,
        2758,
        2756
      ],
      "missing_coordinates": [
        3765
      ],
      "survives": false
    },
    {
      "witness": "inherited_primary_corners_regular",
      "required_coordinates": [
        2648,
        3706,
        2650,
        3708
      ],
      "missing_coordinates": [],
      "survives": true
    }
  ],
  "surviving_pair_edges": [],
  "counts": {
    "retained_source_records": 432,
    "retained_coordinates": 282,
    "removed_coordinates": 91,
    "endpoint_only_operator_arrows": 80,
    "anchor_qualified_operator_arrows": 71,
    "surviving_K_seed_pairs": 34,
    "reached_pairs": 34,
    "shared_word_pair_edges": 0
  },
  "retained_pivots": [
    2756,
    2758,
    2816,
    2818
  ]
}