Product of two permutations : p1op2

p1op2 takes as arguments two permutations.
p1op2 returns the permutation obtained by composition :

1^stargo2^ndarg

Input :

p1op2([3,4,5,2,0,1],[2,0,1,4,3,5])

Output :

[5,3,4,0,2,1]

Warning
Composition is done using the standard mathematical notation, that is the permutation given as second argument is performed first.