Created
August 31, 2015 18:01
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Hard sudoku board
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| 5 3 _ _ 8 _ _ _ 2 | |
| 7 _ _ 6 _ _ 3 _ _ | |
| _ _ 2 3 _ _ 1 _ _ | |
| _ _ _ _ _ _ _ _ 3 | |
| _ 7 _ 2 _ 5 _ 6 _ | |
| 1 _ _ _ _ _ _ _ _ | |
| _ _ 5 _ _ 7 2 _ _ | |
| _ _ 9 _ _ 6 _ _ 7 | |
| 6 _ _ _ 3 _ _ 9 5 |
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