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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 31 -

976 8 5 4 32 1 
5 8 16 3 29 4 7 
4 3 27 1 9 5 6 8 
6 5 7 42 1 8 9 3 
8 29 36 7 4 15
143 985 2 7 6
2 1 4 5 78 639 
7 6 52 93184 
3 9 8 14 6 7 52 
First select a number or an edit function (erase for example) and then click in a box of the sudoku.
 
 
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