CentralGroupoids: Implement Knuth's A2 #309
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Adds Knuth's central groupoid A2 via both an explicit construction and a direct 9x9 multiplication table. The two presentations are proved isomorphic. Progresses teorth#266, and resolves an additional 190 unknown implications.
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Progresses #266 by giving a streamlined construction of the central groupoid A2 and proves it isomorphic to the explicitly given 9x9 multiplication table.
This settles a bunch of anti-implications of the form 168=>X, and resolves 190 previously unknown anti-implications in total.
Construction based on the article D. E. Knuth, Notes on central groupoids, Journal of Combinatorial Theory, Volume 8, Issue 4, 1970