213.75/50.08	MAYBE
213.75/50.08	
213.75/50.08	Problem:
213.75/50.08	 a(x1) -> x1
213.75/50.08	 a(a(b(x1))) -> c(b(b(a(a(x1)))))
213.75/50.08	 b(c(x1)) -> a(x1)
213.75/50.08	
213.75/50.08	Proof:
213.75/50.08	 Open
213.75/50.09	EOF