shithub: riscv

ref: 36c9a2489d1f0e3d4e6a890bb86edde64d719acb
dir: /sys/games/lib/sudoku/boards/hard-2005-04-08.su/

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....7....
.6.8.4.3.
8.....62.
...2.1..7
1.3...8.5
9..5.8...
.94.....6
.5.1.9.8.
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