MAYBE 180.55/55.32 MAYBE 180.55/55.32 180.55/55.32 Problem: 180.55/55.32 a(a(b(x1))) -> b(b(c(a(a(x1))))) 180.55/55.32 a(c(x1)) -> a(a(x1)) 180.55/55.32 180.55/55.32 Proof: 180.55/55.32 Open 180.55/55.33 EOF