Difficult sudoku #3179
| 2 | ||||||||
| 8 | 6 | 7 | 1 | |||||
| 9 | 4 | 5 | 3 | |||||
| 2 | 4 | 3 | ||||||
| 6 | ||||||||
| 1 | 7 | 5 | ||||||
| 7 | 9 | 2 | 1 | |||||
| 2 | 1 | 9 | 5 | |||||
| 4 |
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