shithub: riscv

ref: dd820435e922d927c4f1531fb82aec2bf8fc5cd3
dir: /sys/games/lib/sudoku/boards/medium-2005-01-26.su/

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78.9.2..3
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135.8....
.2..1..78
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67..9..2.
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2..5.9.61
784952613
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317864592
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