The CompHEP symbolic output can be used for further manipulation with an answer which has been obtained by means of the built-in symbolic calculator. It might be a summation of all diagrams to a common denominator expression, a symbolic integration of answer, a representation of answer as a function of special set of variables and so on. ... As it was mentioned above (Section ) the result obtained by summation of all diagrams must be symmetrized in the case of identical outgoing particles. ...