m_perm_paareperm
synopsis: INT m_perm_paareperm(OP a,b)
description:
computes the operation of the PERMUTATION object a, on the
pairs, which are numbered in the lexicographic order. So if the
input is a permutation of the degree n, so the result is a permutation
of the degree (n over 2).
The two objects a and b may the same.
bug:
The PERMUTATION object a must be of VECTOR type
return:
OK or not OK
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