Rules: Divide the grid along the gridlines into some regions, and fill each of the empty cells with a number. When two cells containing the same number touch along an edge, they may not belong to different regions. Given numbers represent the area of the region they belong to. A region may contain none, or one or more of the givens. None of the hidden regions can be alone. In other words, every hidden region has to be adjacent with at least one other hidden region.
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