shithub: riscv

ref: 383667cf31ce8a25d038fbb72705e3cbd5e0eb38
dir: /sys/games/lib/sudoku/boards/medium-2005-05-13.su/

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3..4...2.
.....58.7
..79..1.6
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4..8.1..2
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1.5..72..
9.86.....
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381476925
694215837
257938146
516729384
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763192458