# 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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