275.64/49.98	MAYBE
275.64/49.98	
275.64/49.98	Problem:
275.64/49.98	 a(x1) -> x1
275.64/49.98	 a(a(b(x1))) -> c(c(c(x1)))
275.64/49.98	 c(x1) -> b(a(x1))
275.64/49.98	 c(b(x1)) -> x1
275.64/49.98	
275.64/49.98	Proof:
275.64/49.98	 Open
275.64/49.99	EOF