MAYBE
25.91/10.18	MAYBE
25.91/10.18	
25.91/10.18	Problem:
25.91/10.18	 a(x1) -> x1
25.91/10.18	 a(b(x1)) -> b(a(a(c(b(a(x1))))))
25.91/10.18	 b(x1) -> x1
25.91/10.18	 c(c(x1)) -> x1
25.91/10.18	
25.91/10.18	Proof:
25.91/10.18	 Open
25.91/10.19	EOF