A system for purchasing a product that does not need to be physically present at a point-of-sale includes a point-of-sale device, a product-selection device, a data-analyzing device, an inventory-managing device, and a dispensing machine. The PLA latch includes a first logic array, a second logic array and only one output latch. The method may additionally include modulating resource blocks of the sub-frame or sounding reference symbol sub-slot at the approximate center frequency. The first and second electrodes respectively have a plurality of first and second branch portions arranged alternately. Preferably, the first semiconductor device is electrically coupled to one of the leads by at least one heavy gauge aluminum wire.