shithub: riscv

ref: 2fecc5789efc1cf1f0343890a363adc7ccaaeda5
dir: /sys/games/lib/sudoku/boards/hard-2005-04-07.su/

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.7.6.5...
5..14.9.6
..4.....2
4.....397
.........
732.....4
2.....6..
1.6.38..5
...5.1.2.
973625148
528147936
614389752
461852397
859473261
732916584
285794613
196238475
347561829