shithub: riscv

ref: 24472b1071d197e57a1d551965f492a436ad6a15
dir: /sys/games/lib/sudoku/boards/hard-2005-05-23.su/

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....185.9
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..4.69.27
74.......
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57.68.4..
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8.319....
627318549
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746835912
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491257638
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