Sum Sudoku XIII

Psycho Sudoku!
By PSYCHO SUDOKU  |  June 13, 2007

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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 sum of the numbers in each area marked off by heavy black lines is equal to the little number given in each of those areas. For example, the digits in the upper-rightmost square in the grid and the square directly below it will add up to 15. Now quit wastin’ my time and solve!

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