Difficult sudoku #1641
| 3 | 6 | 7 | 5 | |||||
| 5 | 4 | 2 | 7 | |||||
| 2 | 3 | |||||||
| 1 | 8 | 9 | 3 | |||||
| 7 | 9 | |||||||
| 6 | 5 | 8 | ||||||
| 2 | ||||||||
| 9 | 3 | 1 |
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