shithub: riscv

ref: f3216125def1dbfa242c274f66e13176425fa41e
dir: /sys/games/lib/sudoku/boards/medium-2005-02-22.su/

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..41.9...
9.6......
23..4..8.
.51....9.
3..8.5..7
.4....26.
.7..1..23
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