shithub: riscv

ref: 670137bf0a75813df93d9b727ce70ddb099d11e1
dir: /sys/games/lib/sudoku/boards/medium-2005-02-19.su/

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5....921.
8.7.52...
.3...1...
..4....8.
.53.1.94.
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...4...3.
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817652394
932841765
274396581
653218947
189574623
768425139
495163872
321987456