shithub: riscv

ref: 119f35bc702aded0bd57488c275b54872d290bc3
dir: /sys/games/lib/sudoku/boards/medium-2005-04-04.su/

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2..6...9.
6....48.5
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5....82..
8.17....4
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987325641
329857416
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891762354
472539168