A base station’s neighbor list may become outdated as nearer base stations are deployed. With the histogram computation mechanism, statistical histogram data may be generated for input data of any kind or retrieved from any source that may be specified in a 2-D array or specified in an immediate fashion to specialized data processing hardware. Each solution guide includes a support portion of flat-plate shape and a tip end portion of flat-plate shape that is extendingly provided to form a step in a thickness direction in an end portion of the support portion and is thinner than the support portion. The hammer mechanisms include sidewisely reversible hammer legs having portions received by the rotors sidewisely contiguously. During the read-out of one of the first memory cells, the relevant first word line is activated and the first switching device is activated while the second switching device is closed, and during the read-out of one of the second memory cells, the relevant second word line is activated and the second switching device is activated while the first switching device being closed.