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REFERENCES
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J. T. Butler, ``Fanout-free networks of multivalued gates,'' in Proc. Symposium Multiple-Valued Logic, Charlotte NC, 1977. IEEE Press, NY, 1977, pp. 39-46.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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