U11 tt N U21 tt s plus N M and tt X isNat tt isNat and isNat isNat isNat plus N 0 U11 isNat plus N s M U21 and isNat U11 1 tt 0 U21 1 s 1 plus 2 and 1 isNat 0 0 0 FULL ./TRS/TRCSR/PEANO_nokinds_L.trs