MAYBE
83.61/36.97	MAYBE
83.61/36.97	
83.61/36.97	Problem:
83.61/36.97	 a(c(x1)) -> c(b(x1))
83.61/36.97	 a(x1) -> b(b(b(x1)))
83.61/36.97	 b(c(b(x1))) -> a(c(x1))
83.61/36.97	
83.61/36.97	Proof:
83.61/36.97	 Open
83.61/36.98	EOF