Difficult sudoku #1628
| 7 | 4 | 5 | 6 | |||||
| 2 | ||||||||
| 3 | 7 | 2 | 9 | |||||
| 3 | 4 | 9 | 6 | 2 | ||||
| 9 | 8 | 2 | 1 | 4 | ||||
| 4 | 3 | 9 | 7 | |||||
| 4 | ||||||||
| 5 | 9 | 3 | 4 |
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