MAYBE
39.67/10.56	MAYBE
39.67/10.56	
39.67/10.56	Problem:
39.67/10.56	 a(x1) -> b(b(x1))
39.67/10.56	 c(b(x1)) -> d(x1)
39.67/10.56	 e(b(x1)) -> c(c(x1))
39.67/10.56	 d(b(x1)) -> b(f(x1))
39.67/10.56	 f(x1) -> a(e(x1))
39.67/10.56	 c(x1) -> x1
39.67/10.56	 a(a(x1)) -> f(x1)
39.67/10.56	
39.67/10.56	Proof:
39.67/10.56	 Open
39.67/10.56	EOF