list = psi_plist_add(list, &ntoken);
list = psi_plist_add(list, &ntoken);
list = psi_num_exp_tokens(exp->data.t.falsy, list);
list = psi_plist_add(list, &ntoken);
list = psi_plist_add(list, &ntoken);
list = psi_num_exp_tokens(exp->data.t.falsy, list);