shithub: riscv

ref: 14ac74fce1017b5c23ff4aed6f0289ab82bf71a2
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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4..8.1..2
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1.5..72..
9.86.....
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257938146
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