MAYBE
33.33/10.67	MAYBE
33.33/10.67	
33.33/10.67	Problem:
33.33/10.67	 a(x1) -> x1
33.33/10.67	 a(b(x1)) -> b(c(b(a(x1))))
33.33/10.67	 b(x1) -> a(x1)
33.33/10.67	 c(c(c(x1))) -> x1
33.33/10.67	
33.33/10.67	Proof:
33.33/10.67	 Open
33.33/10.67	EOF