Difficult sudoku #316
| 9 | 2 | 7 | 4 | |||||
| 1 | 9 | |||||||
| 5 | 2 | 7 | ||||||
| 7 | 2 | 5 | ||||||
| 5 | 6 | 8 | ||||||
| 1 | 4 | 3 | ||||||
| 6 | 4 | 8 | ||||||
| 6 | 5 | |||||||
| 2 | 4 | 8 | 6 |
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