Читать книгу Twentieth Century Standard Puzzle Book - Various - Страница 41
XXIII.—THE TWIN PUZZLE SQUARES
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Fill each square by repeating two of its figures in the vacant cells. Then rearrange them all, so that the sums of the corresponding rows in each square are equal, and the sums of the squares of the corresponding cells of these rows are also equal; and so that the sums of the four diagonals are equal, and the sum of the squares of the cells in corresponding diagonals are equal.
