---- CR(R) ---- [van Oostrom, RTA 2008]. R: g(a()) -> f(g(a())) g(b()) -> c(a()) a() -> b() f(x) -> h(x) h(x) -> c(b()) Label: [g(a()) -> f(g(a()))] = 1 [g(b()) -> c(a())] = 0 [a() -> b()] = 1 [f(x) -> h(x)] = 1 [h(x) -> c(b())] = 0