Difficult sudoku #2506
| 1 | 6 | 9 | 3 | 5 | ||||
| 2 | ||||||||
| 5 | 9 | |||||||
| 9 | 7 | 6 | ||||||
| 3 | 7 | 8 | 4 | |||||
| 6 | 4 | 2 | ||||||
| 5 | 6 | |||||||
| 4 | ||||||||
| 4 | 8 | 3 | 1 | 5 |
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