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1. Create white areas surrounded by black walls.
2. Each white area contains only one number.
3. The number of cells in a white area is equal to the number in it.
4. The white areas are separated from each other with a black wall.
5. Cells containing number must not be filled in.
6. The black cells must be linked into a continuous wall.
7. Black cells cannot form a square 2x2 or larger.