{
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      "check": "complete source ladder domain",
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      "check": "j=3 common23 lattice",
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      "check": "j=3 arithmetic progression and total",
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      "check": "j=3 overlapping two-step source widths",
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  "input_verification": [
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      "file": "File_18.md",
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  "next_step": "Certify all three 2-fold expansion stages 1058→1150→1250 as interval images, including their distinct endpoint domains.",
  "passed": true,
  "report": "C88"
}