MAYBE 31.67/10.18 MAYBE 31.67/10.18 31.67/10.18 Problem: 31.67/10.18 a(x1) -> x1 31.67/10.18 a(b(x1)) -> b(c(b(a(x1)))) 31.67/10.18 b(x1) -> a(x1) 31.67/10.18 c(c(x1)) -> x1 31.67/10.18 31.67/10.18 Proof: 31.67/10.18 Open 31.67/10.19 EOF