shithub: riscv

ref: a0a3bf21bc9fce5a0b2bdb435524ed1a7b334d0d
dir: /sys/games/lib/sudoku/boards/medium-2005-05-20.su/

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.4.83.7.9
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9.5......
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3...4...5
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8.9.21.3.
641832759
738695241
925714863
597283416
184956327
362147985
416378592
253469178
879521634