Very difficult sudoku #2013
| 5 | 2 | 9 | 7 | |||||
| 7 | 2 | 3 | 1 | 9 | ||||
| 2 | 5 | |||||||
| 9 | 4 | 1 | 7 | |||||
| 1 | 4 | 7 | 2 | 6 | 3 | |||
| 9 | 4 | 2 | ||||||
| 1 | 6 | |||||||
| 1 | 3 |
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