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