negate_comparison
int negate_comparison(int op);
false_op = negate_comparison(op);
false_comparison = comparison_intersection(data->comparison, negate_comparison(op));
if (data->comparison == comparison_intersection(data->comparison, negate_comparison(op)))
alloc_sname(show_comparison(negate_comparison(op))),
alloc_sname(show_comparison(comparison_intersection(data->comparison, negate_comparison(op)))),
return negate_comparison(op);
filter_by_comparison(&var_rl, negate_comparison(comparison), ret_range);
filter_by_comparison(&ret_range, flip_comparison(negate_comparison(comparison)), var_rl);