shithub: riscv

ref: 57f8b3d1acf273a88568c49d0b83b6863485b9e0
dir: /sys/games/lib/sudoku/boards/medium-2005-02-15.su/

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.6.531..7
.7....8.5
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2...63...
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925687413
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732156948
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516849732