MAYBE
113.73/55.35	MAYBE
113.73/55.36	
113.73/55.36	Problem:
113.73/55.36	 a(x1) -> x1
113.73/55.36	 a(b(b(a(x1)))) -> a(c(c(b(x1))))
113.73/55.36	 c(x1) -> a(b(x1))
113.73/55.36	
113.73/55.36	Proof:
113.73/55.36	 Open
113.73/55.36	EOF