200.60/50.38	MAYBE
200.60/50.38	
200.60/50.38	Problem:
200.60/50.38	 a(c(x1)) -> a(x1)
200.60/50.38	 a(c(b(c(x1)))) -> c(b(c(c(x1))))
200.60/50.38	 c(x1) -> b(a(a(x1)))
200.60/50.38	
200.60/50.38	Proof:
200.60/50.38	 Open
200.60/50.38	EOF