synopsis: INT rz_perm(OP perm,erg)


computes a reduced decomposition of a permutation. The input us a PERMUTATION object perm, and the result is a VECTOR of INTEGER. If you enter the identity, you get an VECTOR of length 0.


perm and erg must be different, so you may better use the general routine rz


 perm = [3,4,6,5,1,2] will give the VECTOR
 [2,1,3,2,5,4,3,5,4], which is to read from right to
 left as a product of elementary transpositions.

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