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2.10.15  Order of a permutation : permuorder

permuorder takes as argument a permutation.
permuorder returns the order k of the permutation p given as argument, that is the smallest integer m such that pm is the identity.
Input :

permuorder([0,2,1])

Output

2

Input :

permuorder([3,2,1,4,0])

Output

6

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