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The (2,1) automata

When Moore neighborhoods are used in a CAM , there is only space enough in the tables for a single bitplane, together with the centers of the three remaining planes. However, there is an additional constraint, namely that the tables always refer to just the even bitplanes; the result has even planes evolving, but odd planes displaying nothing more than functional information about their partners. Moreover, the arrangement is confined to binary automata.

Harold V. McIntosh