Difficult sudoku #2476
| 8 | 4 | 7 | 1 | |||||
| 6 | 9 | |||||||
| 9 | 7 | 3 | 6 | 2 | ||||
| 3 | 7 | 9 | ||||||
| 4 | 7 | |||||||
| 2 | 1 | 7 | ||||||
| 9 | 4 | 5 | 2 | |||||
| 7 | 8 | 4 | ||||||
| 8 |
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