MAYBE 28.28/10.18 MAYBE 28.28/10.18 28.28/10.18 Problem: 28.28/10.18 a(x1) -> x1 28.28/10.18 a(x1) -> b(c(x1)) 28.28/10.18 b(b(x1)) -> a(a(x1)) 28.28/10.18 c(c(c(x1))) -> b(x1) 28.28/10.18 28.28/10.18 Proof: 28.28/10.18 Open 28.28/10.19 EOF