shithub: riscv

ref: 6269cdd5f81371d04f7def12c764619c14c0d206
dir: /sys/games/lib/sudoku/boards/hard-2005-04-09.su/

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..58.4.2.
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.1....5.3
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2.8...7.1
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347125689
812967543
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238456791
659781234
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