MAYBE 41.47/11.10 MAYBE 41.47/11.10 41.47/11.10 Problem: 41.47/11.10 a(b(x1)) -> x1 41.47/11.10 a(c(x1)) -> c(b(b(c(a(a(x1)))))) 41.47/11.10 b(c(x1)) -> x1 41.47/11.10 41.47/11.10 Proof: 41.47/11.10 Open 41.47/11.10 EOF