MAYBE 30.52/10.18 MAYBE 30.52/10.18 30.52/10.18 Problem: 30.52/10.18 a(x1) -> x1 30.52/10.18 a(b(x1)) -> a(a(c(b(b(a(x1)))))) 30.52/10.18 b(x1) -> x1 30.52/10.18 c(c(x1)) -> x1 30.52/10.18 30.52/10.18 Proof: 30.52/10.18 Open 30.52/10.18 EOF