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- case Binary(Plus, e1, e2) => (e1, e2) match{
- case (S(s), _) => S(toStr(eToVal(e1)) + toStr(eToVal(e2)))
- case (_, S(s)) => S(toStr(eToVal(e1)) + toStr(eToVal(e2)))
- case (_, _) => N(toNumber(eToVal(e1)) + toNumber(eToVal(e2)))
- }
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