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It's in one of his books, (I dont think he invented it), entitled Mathematical Puzzles and Diversions, or something like that. It's an added dimension of potential cubes.
(dölj) När du utför drag i ett parti så kan du välja vilket parti som kommer upp därefter genom att välja ett lämpligt alternativ på listan intill Dragknappen. (pauloaguia) (Visa alla tips)