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Sombor (1051)
Instruction:
Divide the grid into regions of size 3 or 4. Within each region, put different numbers 1, 2, 3 (and 4 if the region is of size 4) in top-to-bottom, left-to-right order (that is, numbers in higher rows are smaller, and within a row numbers to the left are smaller). Regions of size 4 cannot share an edge or a corner. The locations of all the 3s are given.