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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



giac documentation written by Renée De Graeve and Bernard Parisse