MAYBE
216.84/55.55	MAYBE
216.84/55.55	
216.84/55.55	Problem:
216.84/55.55	 f(x,a(b(y))) -> a(f(a(b(x)),y))
216.84/55.55	 f(a(x),y) -> f(x,a(y))
216.84/55.55	 f(b(x),y) -> f(x,b(y))
216.84/55.55	
216.84/55.55	Proof:
216.84/55.55	 Open
216.84/55.55	EOF