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Fill in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. The colored area marks a magic squares, i. e., the sums of any row, any column and both main diagonals in these area are always the same. In the other 3 x 3 boxes the sums of any row, and column are always the same, but the main diagonals could have another sum.