shithub: riscv

ref: b31e965ea36f21cf4da91ae33d840999e10a76d4
dir: /sys/games/lib/sudoku/boards/hard-2005-05-15.su/

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7...1...6
..25.4...
..4.9....
2....58.3
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1.79....2
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982564731
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269175843
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493627518