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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 28 -

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

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

solution print this solution

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

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

Difficulty:

Sudoku puzzle explanation

Sudoku 28 -

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