{
  "step": "C317",
  "rows": [
    {
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      "p": -5883,
      "q": -5283,
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    {
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          "f": "12435/4",
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          "q": "-21135/4",
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          "n": "14837/4"
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          "n": "14831/4"
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          "q": "-21139/4",
          "f": "12433/4",
          "n": "14833/4"
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      "C287_replacement": {
        "S": -6343,
        "R": 2650,
        "paired_shift": -458,
        "new_side": 1058,
        "source_admitted": true
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    {
      "i": 4,
      "j": 6,
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      "q": -5286,
      "f": 3107,
      "n": 3707,
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        {
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          "f": "12429/4",
          "n": "14829/4"
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        "S": -6344,
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    },
    {
      "i": 3,
      "j": 7,
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      "q": -5287,
      "f": 3106,
      "n": 3706,
      "cross_widths": [
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          "f": "12423/4",
          "n": "14823/4"
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        {
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          "q": "-21147/4",
          "f": "12425/4",
          "n": "14825/4"
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  "counts": {
    "source_rectangles": 5,
    "exact_phase_rectangles": 10,
    "C287_paired_replacements": 3,
    "C287_failed_extensions": 2
  },
  "duration_rank": 3,
  "equations": {
    "rectangle": "q−p=n−f=600; f−p=n−q=17K",
    "dependency": "(n−q)−(f−p)=(n−f)−(q−p)=0",
    "C287_replacement": "(p,f)→(p−458,f−458); (q,n) retained"
  },
  "source_types": [
    "cumulative LXX_OFF Shem",
    "cumulative LXX_OFF Flood",
    "regular SP Flood boundary",
    "regular SP Noah birth"
  ],
  "new_independent_17K_measurements": false
}