MAYBE
31.50/10.18	MAYBE
31.50/10.19	
31.50/10.19	Problem:
31.50/10.19	 a(x1) -> x1
31.50/10.19	 a(a(x1)) -> b(c(x1))
31.50/10.19	 b(x1) -> x1
31.50/10.19	 c(x1) -> x1
31.50/10.19	 c(b(x1)) -> b(a(c(x1)))
31.50/10.19	
31.50/10.19	Proof:
31.50/10.19	 Open
31.50/10.19	EOF