Difficult sudoku #1706
| 1 | 9 | 8 | 3 | |||||
| 4 | 5 | 1 | ||||||
| 3 | ||||||||
| 6 | 9 | 7 | ||||||
| 3 | 1 | |||||||
| 2 | 7 | 5 | 4 | |||||
| 1 | ||||||||
| 6 | 5 | 8 | ||||||
| 2 | 4 |
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