shithub: riscv

ref: dd820435e922d927c4f1531fb82aec2bf8fc5cd3
dir: /sys/games/lib/sudoku/boards/hard-2005-05-19.su/

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17.3.....
...1.48..
.34.29...
3........
..72485..
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...87.92.
..25.1...
.....2.85
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