shithub: riscv

ref: dd820435e922d927c4f1531fb82aec2bf8fc5cd3
dir: /sys/games/lib/sudoku/boards/medium-2005-01-27.su/

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1.....7..
45...8.1.
6.93....5
2.8..1...
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...9..5.6
7....53.9
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457298613
689317425
278561934
965734182
341982576
716825349
894673251
532149867