MAYBE
40.73/10.91	MAYBE
40.73/10.91	
40.73/10.91	Problem:
40.73/10.91	 a(b(x1)) -> x1
40.73/10.91	 a(c(x1)) -> c(c(b(a(x1))))
40.73/10.91	 b(c(x1)) -> a(b(x1))
40.73/10.91	
40.73/10.91	Proof:
40.73/10.91	 Open
40.73/10.91	EOF