Difficult sudoku #3436
| 9 | 7 | 3 | ||||||
| 6 | 3 | 4 | 2 | |||||
| 4 | 7 | |||||||
| 3 | 6 | 8 | 7 | 9 | 1 | |||
| 8 | 1 | 9 | 2 | 3 | 4 | |||
| 1 | 5 | |||||||
| 6 | 3 | |||||||
| 5 | 7 | |||||||
| 3 | 2 | 8 |
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