A word pattern recognition system improves text input entered via a shorthand-on-keyboard interface. 2 mgmm3 of mercury and which is operated at an input wattage of at most 400 W using direct current, has the length D of the tip area of the anode and the length L of the bulb part in the direction of the tube axis of the lamp set in accordance with the relationship DL2. An optical filter is positioned between the lens system and the photoelectric transmission device, the optical filter having a first film for transmitting visible light and a second film arrangedgrown around the first film to transmit ultraviolet rays or infrared rays. The red, green and blue light sources are switched over while the granular object is passing within an optical detection area. A controller 2 controls the variable delay circuits 12-14 independently of each other so as to align the data streams from the input channels irrespective of the input stream data rates. These techniques can include determining a unique identifier based on unique information of the request and encoding the unique identifier in the requested chunk before sending the requested chunk.