MAYBE
37.06/10.31	MAYBE
37.06/10.31	
37.06/10.31	Problem:
37.06/10.31	 a(x1) -> x1
37.06/10.31	 a(b(x1)) -> b(b(a(c(x1))))
37.06/10.31	 b(x1) -> x1
37.06/10.31	 c(b(c(x1))) -> a(x1)
37.06/10.31	
37.06/10.31	Proof:
37.06/10.31	 Open
37.06/10.31	EOF