Very difficult sudoku #2575
| 2 | 7 | 3 | 6 | |||||
| 6 | 4 | 2 | 9 | |||||
| 5 | 7 | |||||||
| 4 | 6 | 8 | ||||||
| 2 | 4 | |||||||
| 8 | 9 | 3 | 7 | |||||
| 1 | 3 | 9 | ||||||
| 5 | 4 | 2 | ||||||
| 1 | 5 |
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