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This function reverses the elements of the permutation p.
This function computes the inverse of the permutation p, storing the result in inv.
This function advances the permutation p to the next permutation
in lexicographic order and returns GSL_SUCCESS.  If no further
permutations are available it returns GSL_FAILURE and leaves
p unmodified.  Starting with the identity permutation and
repeatedly applying this function will iterate through all possible
permutations of a given order.
This function steps backwards from the permutation p to the
previous permutation in lexicographic order, returning
GSL_SUCCESS.  If no previous permutation is available it returns
GSL_FAILURE and leaves p unmodified.