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Space diagonal
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== Space diagonals of magic cubes== {{main|Magic cube}} A [[magic square]] is an arrangement of numbers in a square grid so that the sum of the numbers along every row, column, and diagonal is the same. Similarly, one may define a [[magic cube]] to be an arrangement of numbers in a cubical grid so that the sum of the numbers on the four space diagonals must be the same as the sum of the numbers in each row, each column, and each pillar.
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