ex newfactor = mf.handle_factor(cit, _ex1);
const expairseq &subseqref = ex_to<expairseq>(newfactor);
combine_overall_coeff(subseqref.overall_coeff);
ex newfactor = mf.handle_factor(cit, _ex1);
const expairseq &subseqref = ex_to<expairseq>(newfactor);
combine_overall_coeff(subseqref.overall_coeff);