Very difficult sudoku #2494
| 3 | 8 | |||||||
| 4 | 6 | 9 | 5 | |||||
| 9 | 8 | 1 | 3 | |||||
| 7 | 3 | 6 | ||||||
| 6 | 5 | |||||||
| 1 | 6 | 7 | 8 | 4 | 5 | 3 | ||
| 1 | 8 | |||||||
| 7 | 8 | 5 | 3 | 1 | ||||
| 3 | 2 | 1 | 9 |
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