Very difficult sudoku #1487
| 2 | 3 | 6 | ||||||
| 5 | 6 | 1 | 4 | 3 | ||||
| 3 | 8 | |||||||
| 1 | 7 | 5 | 3 | |||||
| 9 | 3 | |||||||
| 4 | 9 | 8 | ||||||
| 3 | 9 | 4 | 2 | |||||
| 4 | 2 | 1 | 6 | |||||
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