synopsis: INT rz(OP a,b)
description:computes a reduced decomposition of a PERMUTATION object a, or of VECTOR object a, which needs to be a lehmercode (cf. perm.doc), the result is VECTOR object b of INTEGER objects. This works for permutations i.e. weyl group type A, and for barred permutations, i.e. weyl group type B.
return:OK or ERROR
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