Sudoku number 13

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.

3 9 4 6 8172 5
21 7 95 4 3 8 6 
6 5 87 3 2 9 41
84 2 193 5 6 7 
169 4 75 2 38
7 3 5 2 681 9 4
971 8 2 6 45 3 
5 2 6 3 4 78 1 9
48 3519 6 7 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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