Rules: Place X instances of X, and Y instances of Y, into each region, one number per cell, X <> Y. In the end, all cells containing numbers must form a single connected group, with no 2x2 group of cells filled completely, and every number reachable from every other number through orthogonal paths. Within a region, two equal numbers may or may not occupy adjacent cells, but two different numbers can never occupy adjacent cells.
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