shithub: riscv

ref: d78dd0557c8f854322470a86815ea3e0b5f441a4
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...
.6.....8.
...9..5.6
7....53.9
.9.6...51
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457298613
689317425
278561934
965734182
341982576
716825349
894673251
532149867