71.03/60.04	MAYBE
71.03/60.04	
71.03/60.04	Problem:
71.03/60.04	 f(a(),a()) -> c()
71.03/60.04	 f(b(),x) -> f(x,x)
71.03/60.04	 f(x,b()) -> f(x,x)
71.03/60.04	 a() -> b()
71.03/60.04	
71.03/60.04	Proof:
71.03/60.04	 Open
71.03/60.04	EOF