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The following functions can be used to access and manipulate permutations.
This function returns the value of the i-th element of the
permutation p.  If i lies outside the allowed range of 0 to
n-1 then the error handler is invoked and 0 is returned.  An inline version of this function is used when HAVE_INLINE is defined.
This function exchanges the i-th and j-th elements of the permutation p.