Sudoku Medium

This is a sudoku puzzle. To complete the grid, every vertical, horizontal and 9x9 square must contain the numbers 1-9 once. This is a logical puzzle, so no guessing should be needed;;

5 - - - 7 - - 4 6
- - - - - 3 9 - -
- 8 - - 9 - - 5 -
2 - 8 5 - - - 1 -
- - - - - - - - -
- 6 - - - 2 4 - 8
- 5 - - 3 - - 2 -
- - 4 9 - - - - -
6 3 - - 8 - - - 7
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