shithub: riscv

ref: 75990fc71960d16227e94817d122631f53408c74
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.
....4....
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562814739
871953624
685291347
123467895
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318746952