Durable protective covers for drains and other holes are provided which prevent spills and unwanted liquids from flowing therein. A channel-switching correlation table is looked up to obtain at least one candidate channel, which is predicted to be watched after the current channel. The second disc is mounted to the first side of the first disc so that the first disc axial gear teeth engage the second disc axial gear teeth and provide an axial pawl ratchet assembly. A portion of the device comprises an edge defining an orifice in flow communication with the container and the dosing cavity. A metal word line in direct electrical communication with the control gate electrode of the selection transistor extends perpendicularly with respect to the metal bit line. In one example, a fluorescent signaling section of a label may be perforated and may be mechanically removed from the main portion of the label to selectively provide a label that does not emit a fluorescent signal.