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Omni-MATH / How many functions f:1,2,3,4,5→1,2,3,4,5 have the property that f(1,2,3) and f(f(1,2,3)) are disjoint? · Discussion

Discussing How many functions f:{1,2,3,4,5}→{1,2,3,4,5} have the property that f({1,2,3}) and f(f({1,2,3})) are disjoint? · Omni-MATH

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