shithub: riscv

ref: 2fecc5789efc1cf1f0343890a363adc7ccaaeda5
dir: /sys/games/lib/sudoku/boards/easy-2005-02-11.su/

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.6.....8.
..25.....
.7..864.2
68...21..
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3.864..5.
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164239587
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579186432
683792145
417365829
925418763
398647251
246951378
751823694