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EXAMPLE
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the two permutation of {1,2,...,5}:
{2, 5, 3, 1, 4}
{4, 1, 3, 5, 2}
8 of the 16 permutations of {1,2,...,6} (others reversed):
{1, 3, 6, 4, 2, 5}
{1, 5, 2, 4, 6, 3}
{2, 3, 6, 4, 1, 5}
{2, 5, 3, 1, 4, 6}
{2, 6, 3, 1, 4, 5}
{2, 6, 5, 3, 1, 4}
{3, 6, 4, 2, 1, 5}
{3, 6, 4, 2, 5, 1}
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