Difficult sudoku #1337
| 8 | 1 | 9 | 6 | |||||
| 3 | 7 | 8 | 9 | |||||
| 8 | 3 | 7 | ||||||
| 1 | 5 | |||||||
| 7 | 8 | 5 | 2 | 4 | ||||
| 8 | 4 | |||||||
| 6 | 3 | 7 | 9 | |||||
| 4 | 2 |
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