Difficult sudoku #508
| 4 | 8 | 9 | 7 | 3 | 2 | |||
| 7 | 1 | |||||||
| 1 | 3 | 7 | ||||||
| 1 | 8 | |||||||
| 5 | 7 | 8 | 3 | |||||
| 6 | 1 | |||||||
| 4 | 3 | 9 | ||||||
| 4 | 5 | |||||||
| 5 | 8 | 9 | 4 | 3 | 7 |
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