Difficult sudoku #2473
| 3 | ||||||||
| 2 | 7 | 5 | 6 | |||||
| 1 | 2 | 9 | ||||||
| 2 | 5 | 7 | 1 | |||||
| 1 | 6 | 2 | ||||||
| 8 | 9 | |||||||
| 5 | 2 | 4 | 9 | |||||
| 6 | 4 | 7 | 3 |
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