725.25/299.37	MAYBE
725.25/299.38	
725.25/299.38	Problem:
725.25/299.38	 strict:
725.25/299.38	  a(x1) -> x1
725.25/299.38	  b(x1) -> x1
725.25/299.38	  a(c(x1)) -> b(b(c(a(x1))))
725.25/299.38	  d(b(b(b(x1)))) -> a(d(a(x1)))
725.25/299.38	 weak:
725.25/299.38	  a(b(x1)) -> b(a(x1))
725.25/299.38	  b(a(x1)) -> a(b(x1))
725.25/299.38	
725.25/299.38	Proof:
725.25/299.38	 Open
725.25/299.38	EOF