MAYBE
32.03/10.18	MAYBE
32.03/10.18	
32.03/10.18	Problem:
32.03/10.18	 a(x1) -> x1
32.03/10.18	 a(b(x1)) -> b(b(a(c(a(x1)))))
32.03/10.18	 b(x1) -> x1
32.03/10.18	 c(c(b(x1))) -> x1
32.03/10.18	
32.03/10.18	Proof:
32.03/10.18	 Open
32.03/10.19	EOF