Difficult sudoku #2972
| 1 | 5 | |||||||
| 9 | 2 | 5 | ||||||
| 3 | 9 | 8 | 6 | |||||
| 5 | 2 | |||||||
| 4 | 8 | 7 | 1 | |||||
| 9 | 7 | |||||||
| 8 | 3 | |||||||
| 1 | 7 | 2 | 8 |
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