(VAR x y z ) (RULES a(lambda(x), y) -> lambda(a(x, p(1, a(y, t)))) a(p(x, y), z) -> p(a(x, z), a(y, z)) a(a(x, y), z) -> a(x, a(y, z)) lambda(x) -> x a(x, y) -> x a(x, y) -> y p(x, y) -> x p(x, y) -> y )