Very difficult sudoku #3581
| 1 | 4 | 3 | 9 | |||||
| 3 | 9 | |||||||
| 1 | 5 | 7 | 2 | |||||
| 4 | 5 | 8 | ||||||
| 8 | 6 | 4 | ||||||
| 1 | 9 | 5 | 7 | |||||
| 9 | 1 | 7 | ||||||
| 8 | 1 | 5 | ||||||
| 3 | 4 | 9 |
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