MAYBE
32.27/10.18	MAYBE
32.27/10.18	
32.27/10.18	Problem:
32.27/10.18	 a(x1) -> x1
32.27/10.18	 a(a(a(x1))) -> b(x1)
32.27/10.18	 b(c(x1)) -> c(a(c(b(x1))))
32.27/10.18	 c(x1) -> x1
32.27/10.18	
32.27/10.18	Proof:
32.27/10.18	 Open
32.27/10.19	EOF