Difficult sudoku #537
| 3 | 4 | |||||||
| 5 | 1 | |||||||
| 8 | 6 | |||||||
| 6 | 9 | 2 | ||||||
| 4 | 5 | |||||||
| 8 | 2 | 1 | 9 | 6 | ||||
| 4 | 6 | 7 | 1 | |||||
| 8 | 3 | |||||||
| 1 |
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