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test for exhaustiveness calls for reasoning so circuitous that it is omitted here.In any case, such a conclusion requires independent checking.These diagrams are of interest, as exhibiting schematic symmetries, or rotation periods 2 or 3 or 7. I think it correct to assert further (cf.§3) that the completion of each pattern by inclusion of its minor polyedra is uniquely determinate; so that 11 appears to be the total number of systems unlike in respect of numbers and contiguities.Not inapposite may be an obiter dictum from the late mathematician of wide vision, Maxime Bocher."Moreover, although the mathematical method is the traditional one for arriving at the truth concerning geometri- cal facts, it is not the only one.Direct appeal to the intuition is often a short and fairly safe cut to geometric results."*
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