Very difficult sudoku #1456
| 5 | 4 | 2 | ||||||
| 1 | 9 | 8 | 3 | 5 | 7 | |||
| 8 | 4 | 7 | 9 | 1 | ||||
| 1 | ||||||||
| 6 | 9 | 3 | 1 | 2 | ||||
| 9 | 1 | 4 | 7 | 6 | 8 | |||
| 6 | 9 | 1 |
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