196.08/50.09	MAYBE
196.08/50.10	
196.08/50.10	Problem:
196.08/50.10	 a(x1) -> x1
196.08/50.10	 a(b(x1)) -> b(c(a(a(x1))))
196.08/50.10	 a(c(c(x1))) -> b(a(x1))
196.08/50.10	
196.08/50.10	Proof:
196.08/50.10	 Open
196.08/50.10	EOF