MAYBE 112.14/47.66 MAYBE 112.14/47.66 112.14/47.66 Problem: 112.14/47.66 a(d(x1)) -> d(b(x1)) 112.14/47.66 a(x1) -> b(b(b(x1))) 112.14/47.66 b(d(b(x1))) -> a(c(x1)) 112.14/47.66 c(x1) -> d(x1) 112.14/47.66 112.14/47.66 Proof: 112.14/47.66 Open 112.14/47.67 EOF