Very difficult sudoku #2749
| 7 | 1 | 3 | ||||||
| 2 | 8 | 9 | ||||||
| 4 | ||||||||
| 5 | 6 | 2 | ||||||
| 1 | 9 | |||||||
| 8 | 9 | 7 | ||||||
| 1 | 3 | 6 | 8 | 4 | ||||
| 8 | 7 | 3 | ||||||
| 9 | 2 |
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