MAYBE
37.59/10.30	MAYBE
37.59/10.30	
37.59/10.30	Problem:
37.59/10.30	 a(x1) -> b(x1)
37.59/10.30	 a(b(x1)) -> b(a(c(x1)))
37.59/10.30	 b(b(x1)) -> x1
37.59/10.30	 c(c(x1)) -> a(x1)
37.59/10.30	
37.59/10.30	Proof:
37.59/10.30	 Open
37.59/10.30	EOF