Plan 9 from Bell Labs’s /usr/web/sources/plan9/sys/games/lib/sudoku/boards/hard-2005-04-03.su

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Distributed under the MIT License.
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.2...6.7.
..62.5...
3..9....1
4...3.1..
15.....34
..8.5...9
9....3..6
...8.94..
.8.1...9.
821346975
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157692834
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572869413
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