shithub: riscv

ref: c309f466eff33a331f9a8d8c8b18cfe613c1d3f4
dir: /sys/games/lib/sudoku/boards/medium-2005-05-18.su/

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....4....
57.1.6..2
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981247365
573186942
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168729453
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842965137
697314528
315872694