A remote control unit that learns commands from associated remote control units associated with specific pieces of electronic equipment is described. The package plant includes an inlet for raw water, followed by an ozonator for disinfecting the water. The workpiece pad furthermore comprises an ordered array of micro-structures. The system or method locates a respondent to answer the person’s query wherein the respondent is geographically the nearest respondent to the person within a given jurisdiction. Further, the embodiment of the invention also exploits a MP3 codec to allow voice data to be played or recorded via the USB device of the embodiment of the invention. 2<frf<3here,f is a focal length of the entire single lens element,fr is a focal length due to the refraction effect of the single lens element,T is a thickness of the single lens element on an optical axis, andNA is a numerical aperture of a single lens element at an incident side.