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    "c > a and c > b when solving for a leg.",
    "Exactly two fields are inputs when solving. Explicit solve_for selects the output. If all three are supplied without solve_for, they are verified rather than overwritten.",
    "Interactive evaluation, shared URLs, and REST use the same engine, solve_for contract, and error codes.",
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    "Non-positive side → SIDE_NOT_POSITIVE",
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      "title": "Euclid, Elements, Book I, Proposition 47",
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