Find squares

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Find squares
Find squares is a type of logic puzzles.
It is played on a rectangular or square grid with numbers or question signs in some cells. The goal is to blacken some cells of a grid according to the following rules:

- Cells with numbers or question signs can not be blacken.
- Black cells form square areas, that must not be orthogonally adjacent.
- A number in a circle indicates the total number of black cells in areas orthogonally neighboring the numbered cell.
- A cell with a question sign must have at least one adjacent black cell.
- All the white cells must be connected horizontally or vertically.

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