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    "Not IEEE remainder or floating-point fmod",
    "Not /calc/math/gcf — gcd is only used for invertibility",
    "modulus = 0 → DIVISION_BY_ZERO",
    "gcd(a,m) ≠ 1 → NOT_INVERTIBLE",
    "|m| < 2 on inverse → INVALID_INPUT",
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      "title": "ISO 80000-2:2019 Quantities and units — Mathematics (integer division / remainder)",
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