Very difficult sudoku #2174
| 7 | 4 | 6 | ||||||
| 3 | ||||||||
| 6 | 5 | 4 | ||||||
| 1 | 6 | 9 | 7 | |||||
| 2 | 3 | 6 | ||||||
| 4 | 8 | 5 | 9 | |||||
| 1 | 8 | 3 | ||||||
| 5 | ||||||||
| 9 | 6 | 1 |
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