Very difficult sudoku #591
| 2 | 8 | 7 | 6 | 3 | ||||
| 9 | 7 | |||||||
| 3 | 1 | |||||||
| 2 | 9 | |||||||
| 1 | 6 | 7 | 8 | |||||
| 7 | 3 | 9 | ||||||
| 9 | 8 | 6 | ||||||
| 9 | 1 | 4 | ||||||
| 3 | 7 |
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