10x15:b0BbB0eBb2d1b1Bb2n2b2m1cB0c1aB0d0Ba1cB0c1mBb1nBb2Bb0dBb2e1Bb0Bb
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Light Up, from Simon Tatham's Portable Puzzle Collection
https://www.chiark.greenend.org.uk/~sgtatham/puzzles/js/lightup.html#10x15:b0BbB0eBb2d1b1Bb2n2b2m1cB0c1aB0d0Ba1cB0c1mBb1nBb2Bb0dBb2e1Bb0Bb