Difficult sudoku #3593
| 3 | 4 | 6 | 8 | |||||
| 5 | 9 | 3 | 7 | |||||
| 2 | 5 | 8 | 1 | |||||
| 2 | 9 | 5 | ||||||
| 7 | 6 | |||||||
| 4 | 2 | |||||||
| 6 | 3 | 9 | 4 | |||||
| 7 | 1 | 4 | ||||||
| 7 | 3 |
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