shithub: riscv

ref: b37238edb8f86809cdb395c235f9f2cc3f24d388
dir: /sys/games/lib/sudoku/boards/medium-2005-04-04.su/

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2..6...9.
6....48.5
..73....1
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5....82..
8.17....4
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613974825
987325641
329857416
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536418279
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472539168