MAYBE
31.56/10.18	MAYBE
31.56/10.18	
31.56/10.18	Problem:
31.56/10.18	 a(x1) -> x1
31.56/10.18	 a(b(x1)) -> b(b(a(c(a(x1)))))
31.56/10.18	 b(x1) -> x1
31.56/10.18	 c(c(c(x1))) -> x1
31.56/10.18	
31.56/10.18	Proof:
31.56/10.18	 Open
31.56/10.18	EOF