Black units

Black units is a logic puzzle.
The task consists of a grid, with circles in some cells; a circle may have a number inside or not. The task is to blacken some cells of a grid according to the following rules:

- Cells with circles can not be blacken.
- Black cells form orthogonally contiguous areas.
- A number in a circle indicates the total number of black cells in areas orthogonally neighboring the circled cell.
- Cells with empty circles may have any number of black cells around them.

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