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Put one digit from 1–9 in each square so that the following two conditions are met: 1) each row, column, and 3-x-3 box, as marked by shading in the grid, contains the digits 1–9 exactly one time, and 2) the sums of the numbers in each area marked by heavy black lines total the little number given in each of those areas. For example, the digits in the upper-leftmost square in the grid and the two squares directly underneath it will add up to 21. Now solve, damn it!
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