197.68/50.42 MAYBE 197.68/50.42 197.68/50.42 Problem: 197.68/50.42 0(0(0(0(x1)))) -> 1(0(0(1(x1)))) 197.68/50.42 0(1(0(1(x1)))) -> 0(0(1(0(x1)))) 197.68/50.42 197.68/50.42 Proof: 197.68/50.42 Open 197.68/50.43 EOF