Sudoku number 4

Difficulty:

Sudoku is a diagram of nine by nine boxes in which the numbers from 1 to 9 must be entered. The diagram of 9x9 is again subdivided into a box of 3x3. A number from 1 to 9 must be entered in each box.
In order to solve the puzzle, the boxes must be filled in such a way that in each row, every column and each box of 3x3 the numbers 1 to 9 only occur once.

You do not have to be a clever head, just a little patience and logical reasoning is needed to solve the puzzle.

51 8 7 6 2 9 4 3 
4 96 8 53 2 17 
3 2 7 14 9 8 5 6
76 1 4 25 39 8
2 53 91 87 6 4
9 8 4 63 7 52 1 
8 4 5 271 6 3 9 
67 239 41 8 5 
1 3 9 58 6 47 2 

First select a number or an edit function (erase for example) and then click in a box of the sudoku.
 
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