construct the permutations of a list
list/set of objects or an integer
If n is a list or set, then permute returns a list of all the permutations of the elements of n, taken r at a time. If n is a non-negative integer, it is interpreted in the same way as a list of the first n integers. If r is not specified, then it is taken to be equal to the number of elements in n.
The permutations are generated in order. Duplicates in n are respected.
The function numbperm will compute the number of possible permutations: numbperm(n, r) = nops(permute(n, r)).
The command with(combinat,permute) allows the use of the abbreviated form of this command.
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