Difficult sudoku #2106
| 1 | 5 | 4 | 7 | 8 | 6 | 2 | ||
| 3 | 5 | |||||||
| 9 | 3 | |||||||
| 1 | 3 | 2 | 4 | |||||
| 7 | 8 | 9 | 6 | |||||
| 3 | ||||||||
| 3 | 7 | 2 | 1 | |||||
| 9 | 5 | 1 | 7 |
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