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5.10.8  Checking for a permutation: is_permu

is_permu is a boolean function.
is_permu takes as argument a list.
is_permu returns 1 if the argument is a permutation and returns 0 if the argument is not a permutation.
Input:

is_permu([2,1,3])

Output:

0

Input:

is_permu([2,1,3,0])

Output:

1

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