717.03/299.38	MAYBE
717.03/299.38	
717.03/299.38	Problem:
717.03/299.38	 strict:
717.03/299.38	  b(a(a(b(x1)))) -> a(a(a(a(x1))))
717.03/299.38	  a(b(b(a(x1)))) -> b(b(b(b(x1))))
717.03/299.38	 weak:
717.03/299.38	  b(x1) -> b(b(b(x1)))
717.03/299.38	
717.03/299.38	Proof:
717.03/299.38	 Open
717.03/299.39	EOF