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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.
(ascunde) Poţi să foloseşti HTML în mesajele tale sau dacă eşti un membru plătitor,poţi de asemenea folosii Editorul Bogat de Texte (pauloaguia) (arată toate sfaturile)