MAYBE 44.07/12.37 MAYBE 44.07/12.37 44.07/12.37 Problem: 44.07/12.37 a(x1) -> b(x1) 44.07/12.37 a(c(x1)) -> x1 44.07/12.37 c(b(b(x1))) -> a(a(a(c(c(x1))))) 44.07/12.37 44.07/12.37 Proof: 44.07/12.37 Open 44.07/12.37 EOF