198.53/50.29	MAYBE
198.53/50.29	
198.53/50.29	Problem:
198.53/50.29	 a(a(b(b(x1)))) -> b(b(b(a(x1))))
198.53/50.29	 b(a(x1)) -> a(a(a(a(x1))))
198.53/50.29	
198.53/50.29	Proof:
198.53/50.29	 Open
198.53/50.29	EOF