shithub: plan9front

ref: ae61eb9381f6b0c70e1c52bf2c2b7f4cd0b5bb6f
dir: /sys/games/lib/sudoku/boards/hard-2005-04-07.su/

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.7.6.5...
5..14.9.6
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4.....397
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732.....4
2.....6..
1.6.38..5
...5.1.2.
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614389752
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