MAYBE
42.40/11.71	MAYBE
42.40/11.71	
42.40/11.71	Problem:
42.40/11.71	 a(x1) -> b(x1)
42.40/11.71	 b(a(c(x1))) -> c(c(b(a(a(x1)))))
42.40/11.71	 c(b(x1)) -> x1
42.40/11.71	
42.40/11.71	Proof:
42.40/11.71	 Open
42.40/11.71	EOF