shithub: riscv

ref: a3dc4d80a899b28130729721b90a0506e44b8d76
dir: /sys/games/lib/sudoku/boards/easy-2005-02-14.su/

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..2..9.4.
7.....985
6....3.2.
9....1.5.
..58976..
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.5.6....9
876.....3
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512789346
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689543721
968231457
145897632
327465198
453612879
876954213
291378564