Difficult sudoku #2668
| 1 | ||||||||
| 6 | 4 | |||||||
| 1 | 9 | 8 | 3 | |||||
| 6 | 2 | 3 | 1 | |||||
| 7 | 3 | 2 | ||||||
| 7 | 5 | 4 | ||||||
| 5 | 1 | |||||||
| 3 | 1 | 4 | 6 | 9 | ||||
| 5 |
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