You need to draw borders so that the grid is divided into regions where the number of cells in each region equals the number written inside it. A region may contain one, several, or no numbers at all — all are valid. If there is no number, the size of the region is determined automatically by the number of cells. Regions of the same size cannot touch by sides, but may touch at corners. The goal is to correctly divide the entire grid into such regions. The regions may only have rectangular (including square) shapes, with a maximum size of 9 cells.
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