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Partiti (287)

Instruction:
Place one or more digits from 1 to 9 in arbitrary order in each empty cell, such that a number in the top left corner of each cell is the sum of digits entered in that cell. Same digits cannot be placed in cells that touch, even diagonally. The solution below shows the digits in ascending order but this is not a requirement to receive credit for the puzzle.

Reference: WPC 2017 (11)