MAYBE
216.97/55.53	MAYBE
216.97/55.53	
216.97/55.53	Problem:
216.97/55.53	 f(x,a(b(y))) -> a(f(a(b(x)),y))
216.97/55.53	 f(a(x),y) -> f(x,a(y))
216.97/55.53	 f(b(x),y) -> f(x,b(y))
216.97/55.53	
216.97/55.53	Proof:
216.97/55.53	 Open
216.97/55.54	EOF