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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 7 -

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

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

solution print this solution

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

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

Difficulty:

Sudoku puzzle explanation

Sudoku 7 -

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