In the development of computer programs for automatic checkout and the simplification of switching networks, certain simple logical routines occur frequently. Only a few such routines are needed to cover a large number of situations. A concise list or catalog of such routines is given in this paper. The shortest and simplest of these routines are called micro-programs. Somewhat more involved routines applying one or more micro-programs are given also. The use of the micro-programs and the more involved routines in automatic checkout is discussed.
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House et al. (1962) studied this question.
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