shithub: riscv

ref: 6269cdd5f81371d04f7def12c764619c14c0d206
dir: /sys/games/lib/sudoku/boards/hard-2005-05-15.su/

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7...1...6
..25.4...
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2....58.3
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1.79....2
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735812496
982564731
614793285
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493627518