Difficult sudoku #1529
| 3 | 6 | 7 | ||||||
| 9 | ||||||||
| 6 | 3 | 2 | 9 | |||||
| 7 | 6 | |||||||
| 1 | 5 | |||||||
| 5 | 8 | |||||||
| 4 | 9 | |||||||
| 2 | 9 | 3 | 6 | |||||
| 9 | 1 | 2 | 6 | 3 |
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