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A conservative logic element (CLE) is a multiple-output logic element whose weight of an input vector is equal to that of the corresponding output vector, and fan-out of each output terminal is restricted to one. A CLE is a generalized model of magnetic bubble logic elements, etc. In order to realize an arbitrary function, it is necessary to use constant-supplying elements (CSE's). In this correspondence, we consider the universality of CLE's in relation to the number of CSE's.
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Sasao et al. (1979) studied this question.
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