Difficult sudoku #652
| 4 | 2 | 3 | 1 | |||||
| 9 | 6 | |||||||
| 1 | 5 | 3 | ||||||
| 9 | 6 | |||||||
| 2 | ||||||||
| 1 | 7 | 4 | 3 | |||||
| 6 | 3 | 5 | 2 | |||||
| 5 | 7 | 1 | 3 | 4 | ||||
| 4 | 6 | 1 | 7 |
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