Difficult sudoku #1993
| 4 | 9 | 5 | ||||||
| 6 | 3 | 2 | 9 | 7 | ||||
| 7 | 2 | |||||||
| 4 | 9 | 1 | 5 | 3 | ||||
| 6 | 7 | |||||||
| 6 | 7 | |||||||
| 5 | 9 | 1 | 7 | 2 | ||||
| 1 | ||||||||
| 4 | 6 |
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