MAYBE 213.34/55.43 MAYBE 213.34/55.43 213.34/55.43 Problem: 213.34/55.43 f(x,a(b(y))) -> f(a(a(b(x))),y) 213.34/55.43 f(a(x),y) -> f(x,a(y)) 213.34/55.43 f(b(x),y) -> f(x,b(y)) 213.34/55.43 213.34/55.43 Proof: 213.34/55.43 Open 213.34/55.43 EOF