shithub: riscv

ref: 963cfc9a6f6e721f52aa949e6d1af0c3e8dc2ecc
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...
.5.....2.
...42...6
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4.8....5.
5..849.3.
864531297
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925687413
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389425176
732156948
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516849732