MAYBE
72.79/22.13	MAYBE
72.79/22.13	
72.79/22.13	Problem:
72.79/22.13	 a(x1) -> x1
72.79/22.13	 a(b(x1)) -> b(c(x1))
72.79/22.13	 c(c(x1)) -> b(a(c(a(a(x1)))))
72.79/22.13	
72.79/22.13	Proof:
72.79/22.13	 Open
72.79/22.13	EOF