MAYBE 29.13/10.17 MAYBE 29.13/10.17 29.13/10.17 Problem: 29.13/10.17 a(x1) -> x1 29.13/10.17 a(b(x1)) -> b(a(c(b(a(x1))))) 29.13/10.17 b(x1) -> x1 29.13/10.17 c(c(x1)) -> x1 29.13/10.17 29.13/10.17 Proof: 29.13/10.17 Open 29.13/10.18 EOF