NO Problem: 0(1(2(3(4(5(1(x))))))) -> 1(2(3(4(5(1(1(0(1(2(3(4(5(0(1(2(3(4(5(x))))))))))))))))))) 0(1(2(3(4(5(1(x))))))) -> 1(2(3(4(5(1(1(0(1(2(3(4(5(0(1(2(3(4(5(0(1(2(3(4(5(x))))))))))))))))))))))))) Proof: Nonconfluence Processor: terms: 1(2(3(4(5(1(1(0(1(2(3(4(5(0(1(2(3(4(5(x))))))))))))))))))) *<- 0(1(2(3(4(5(1(x))))))) ->* 1(2(3(4(5(1(1(0(1(2(3(4(5(0(1(2(3(4(5(0(1(2(3(4(5(x))))))))))))))))))))))))) Qed