Very difficult sudoku #655
| 2 | 7 | 6 | 5 | |||||
| 3 | 6 | |||||||
| 1 | 9 | 3 | ||||||
| 7 | 3 | 9 | 6 | |||||
| 1 | 6 | 2 | 5 | |||||
| 4 | 7 | |||||||
| 3 | 7 | |||||||
| 7 | 4 | 8 | 9 | |||||
| 8 | 1 |
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