shithub: riscv

ref: 5030157da9e89da53739b13c36942a5355de669f
dir: /sys/games/lib/sudoku/boards/medium-2005-04-20.su/

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....5.21.
.2.7..6.9
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58..2..96
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346958217
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862197435
715834962
439562871