Difficult sudoku #3372
| 5 | 1 | 9 | ||||||
| 9 | 3 | 5 | 1 | |||||
| 7 | ||||||||
| 4 | 7 | 6 | 2 | |||||
| 2 | 5 | 6 | 7 | |||||
| 6 | 4 | 3 | 1 | |||||
| 4 | ||||||||
| 1 | 9 | 8 | 6 | |||||
| 2 | 6 | 3 |
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