Embodiments of the invention may include systems and methods for notifying a prescriber or other entity of duplicate product prescriptions. The area adjacent to the central portion of the barrel have an increased performance with respect to the central portion of the barrel to effectively enlarge the sweet spot, or preferred hitting area. The connection device has a C-shaped member fastened on the back post or the front end of the seat bar extends. A predictive error signal is generated representing an error between the input video signal and the prediction picture signal.