Place lightbulbs in some cells (one lightbulb per cell) so that all cells in the grid are lightened. Lightbulbs can give light in straight lines (up, down, right, left) until the rays meet a bleck cell or the edge of the grid. Lightbulbs should not lighten each other. A digit in a cell indicates the number of lightbulbs that are horizontally or vertically adjacent to that cell.
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