A data processing system and method. The system apparatus and method may also allow a player of the gaming system to exchange the ability to modify a future wager for a reduced amount of cashable credits. The dummy compensation word is calculated so that the unmodified value maintained in the checksum is the checksum for the data packet including the dummy compensation word. \u201d In this first use, XeF2 is used to remove the metal liner, TaN\u2014Ta, after copper CMP. The perimeter region, for example, can have a curved section extending inwardly from the perimeter edge of the backing plate or from a flat rim at the perimeter edge. A cabinet 3 of a blasting machine 1 is compartmentalized at a predetermined position into an upper space and a lower space by mesh members that allow the abrasive to pass therethrough to form a blasting chamber 2 having a bottom wall surface 20 defined by the mesh members.