shithub: riscv

ref: e4b215d77ff0f63eaf42d737a1a4f75d2a2037aa
dir: /sys/games/lib/sudoku/boards/medium-2005-05-18.su/

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