shithub: riscv

ref: c6ad540af56be95b458008ae3abd3432b71d49dd
dir: /sys/games/lib/sudoku/boards/medium-2005-02-19.su/

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