A carry look-ahead adder includes an input stage to produce generate bits and propagate bits from input signals. In the event of an access to one of the memory cells, a set circuit sets the assigned register bit, and a reset circuit resets a set register bit. , pI bands, utilizing capillary isoelectric focusing within a first microchannel. The ring balancer facilitates automatic lamp striking and the lamps can be advantageously driven by a common voltage source. The hook member is integrally formed with an inner wall face of the cartridge holder to engage the liquid cartridge when the liquid cartridge is mounted in the cartridge holder. If the address information is consistent, it indicates that the specified data encryption key is the correct key to be used for the encryptiondecryption operation.