Difficult sudoku #1516
| 8 | 4 | 5 | 2 | 3 | 6 | |||
| 4 | 6 | |||||||
| 9 | 2 | |||||||
| 4 | 9 | |||||||
| 6 | 9 | 3 | 5 | 2 | ||||
| 3 | 6 | |||||||
| 9 | 2 | 5 | 8 | |||||
| 3 | 1 | 7 | 6 | 5 |
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