shithub: riscv

ref: c6ad540af56be95b458008ae3abd3432b71d49dd
dir: /sys/games/lib/sudoku/boards/hard-2005-04-03.su/

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.2...6.7.
..62.5...
3..9....1
4...3.1..
15.....34
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9....3..6
...8.94..
.8.1...9.
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683124597