shithub: riscv

ref: 06ea44c895a5f97b7b9b65fce84dec2700f443fb
dir: /sys/games/lib/sudoku/boards/medium-2005-02-15.su/

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.6.531..7
.7....8.5
.....74..
2...63...
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...42...6
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4.8....5.
5..849.3.
864531297
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925687413
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732156948
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516849732