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If the number of functions f: {1, 2, 3, ...

If the number of functions `f: {1, 2, 3, 4, 5, 6, 7, 8, 9, 10} -> {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}` which satisfy the16 0 property that `f(i) + f(j) = 11` for all values of i and j such that `i+j=11, is (625)k`, find `k`.

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