208.52/50.00	MAYBE
208.52/50.00	
208.52/50.00	Problem:
208.52/50.00	 a(x1) -> x1
208.52/50.00	 a(a(x1)) -> b(c(x1))
208.52/50.00	 c(b(b(x1))) -> a(a(b(a(x1))))
208.52/50.00	
208.52/50.00	Proof:
208.52/50.00	 Open
208.74/50.00	EOF