MAYBE
41.25/11.47	MAYBE
41.25/11.47	
41.25/11.47	Problem:
41.25/11.47	 a(x1) -> x1
41.25/11.47	 a(b(b(x1))) -> b(b(b(c(a(a(x1))))))
41.25/11.47	 c(b(x1)) -> x1
41.25/11.47	
41.25/11.47	Proof:
41.25/11.47	 Open
41.25/11.48	EOF