shithub: riscv

ref: f79ba91129f15c3804a4e836cbfb822608a1059b
dir: /sys/games/lib/sudoku/boards/medium-2005-05-13.su/

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3..4...2.
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..79..1.6
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1.5..72..
9.86.....
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257938146
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763192458