shithub: riscv

ref: c172881606bfa194399a0b181b419a34488331d6
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
947538261
294385176
756129483
318746952