+ x 0 x + minus x x 0 minus 0 0 minus minus x x minus + x y + minus y minus x * x 1 x * x 0 0 * x + y z + * x y * x z * x minus y minus * x y + 2 0 0 minus 1 * 2 1 0 FULL ./TRS/SK90/4.03.trs