Difficult sudoku #1964
| 6 | 1 | 9 | ||||||
| 4 | 3 | |||||||
| 7 | 8 | 9 | 4 | 6 | ||||
| 4 | 8 | 5 | ||||||
| 9 | 4 | 2 | ||||||
| 8 | 5 | 9 | ||||||
| 5 | 1 | 9 | 3 | 8 | ||||
| 4 | 6 | |||||||
| 9 | 1 | 2 |
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