Very difficult sudoku #2429
| 1 | 2 | |||||||
| 9 | 3 | 2 | 1 | |||||
| 8 | 2 | 7 | 6 | |||||
| 5 | 9 | 1 | 8 | |||||
| 8 | 5 | 4 | ||||||
| 5 | 6 | 4 | 9 | |||||
| 7 | 1 | 5 | ||||||
| 4 | 8 | 6 | 7 |
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