Difficult sudoku #617
| 4 | 5 | 3 | 2 | 8 | ||||
| 2 | 1 | 6 | 3 | 4 | ||||
| 3 | 8 | 9 | 6 | |||||
| 9 | 1 | |||||||
| 2 | ||||||||
| 6 | 8 | 3 | 1 | 4 | 9 | |||
| 7 | 9 | 6 | 5 |
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