shithub: riscv

ref: e8c3eb87d27f95a9a0b89a93164dba42427659ec
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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257938146
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763192458