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Sudoku puzzle explanation

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.

Sudoku 20 -

25 81 3 96 47
6 7 34 2 5 91 8
4 9 1 78 6 5 32 
3 1 7 2 948 6 5 
54 2 8 6 7 3 9 1 
86 951 3 2 7 4
7 35 6 481 2 9
9 24 351 78 6 
1 8 69 7 2 4 5 3 
First select a number or an edit function (erase for example) and then click in a box of the sudoku.
 
 
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