MAYBE MAYBE TRS: { lambda(x) -> x, a(x, y) -> x, a(x, y) -> y, a(lambda(x), y) -> lambda(a(x, p(1(), a(y, t())))), a(a(x, y), z) -> a(x, a(y, z)), a(p(x, y), z) -> p(a(x, z), a(y, z)), p(x, y) -> x, p(x, y) -> y } DUP: We consider a duplicating system. Trs: { lambda(x) -> x, a(x, y) -> x, a(x, y) -> y, a(lambda(x), y) -> lambda(a(x, p(1(), a(y, t())))), a(a(x, y), z) -> a(x, a(y, z)), a(p(x, y), z) -> p(a(x, z), a(y, z)), p(x, y) -> x, p(x, y) -> y } Fail