Difficult sudoku #1994
| 1 | ||||||||
| 4 | 2 | |||||||
| 9 | 8 | 2 | 5 | |||||
| 3 | 1 | 9 | ||||||
| 1 | 8 | 6 | 3 | |||||
| 9 | 3 | 7 | ||||||
| 7 | 5 | 6 | 3 | |||||
| 5 | 8 | |||||||
| 8 |
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