shithub: riscv

ref: 52ad5b3ec5138a85e4c976013adbc54642f19b74
dir: /sys/games/lib/sudoku/boards/medium-2005-04-04.su/

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2..6...9.
6....48.5
..73....1
3.9...4..
...1.6...
..4...5.7
5....82..
8.17....4
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245681793
613974825
987325641
329857416
758146932
164293587
536418279
891762354
472539168