Difficult sudoku #1420
| 4 | 9 | 8 | 2 | 5 | 1 | 3 | 7 | |
| 2 | 1 | 7 | 8 | 6 | ||||
| 3 | 5 | 7 | ||||||
| 4 | 3 | 8 | 6 | 2 | 7 | |||
| 1 | 4 | 2 | ||||||
| 9 | 2 | 4 | 8 |
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