Difficult sudoku #1660
| 5 | 1 | 8 | 4 | 9 | ||||
| 6 | 1 | 5 | ||||||
| 2 | 5 | 3 | ||||||
| 5 | 2 | 6 | 8 | |||||
| 1 | 9 | 4 | ||||||
| 3 | 5 | 1 | ||||||
| 3 | 5 | 6 | ||||||
| 4 | 9 | 7 | 3 | |||||
| 8 |
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