Difficult sudoku #3449
| 3 | 2 | 4 | ||||||
| 5 | 3 | 6 | ||||||
| 1 | 6 | |||||||
| 2 | 4 | 7 | 5 | |||||
| 5 | 3 | 7 | ||||||
| 4 | 1 | |||||||
| 1 | 7 | 9 | 8 | |||||
| 3 | 2 | |||||||
| 5 | 4 | 6 |
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