Some implementations provide a structure that includes a first package substrate, a first component, a second package substrate, a second component, and a third component. The determination section determines whether a pair of the first sheet and the second sheet is eligible for the high-speed duplex printing based on the combination of the length of the first sheet and the length of the second sheet before the second sheet conveyed by the reconveyer. In yet another embodiment, the system may be configured to resynchronize a plurality of instances of data blocks depending upon dirty indicators corresponding to the plurality of instances of data blocks. A combination of the continuous horizontal and vertical sliding of the hanger slide and mounting fastener allows for substantially infinite placement of the mounting fastener in the opening. This invention, in its preferred embodiments, is specifically adapted to meet the technical requirements of AC power line communications, while taking advantage of RF communication within buildings or facilities. A pair of cross-brace members are pivotally secured at first end portions upon the bas member so as to be movable between first operative position and a second inoperative position in order to permit the entire pallet structure to be rolled up, folded, or otherwise knocked-down.