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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 abc 9 -

ADEIKNPRT

T	D	I	A	P	N	K	R	E
P	R	E	D	I	K	A	N	T
A	K	N	E	R	T	P	I	D
D	I	T	R	A	E	N	P	K
K	P	R	T	N	D	E	A	I
N	E	A	P	K	I	D	T	R
R	T	K	N	D	P	I	E	A
E	N	D	I	T	A	R	K	P
I	A	P	K	E	R	T	D	N

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

solution print this solution

T	D	I	A	P	N	K	R	E
P	R	E	D	I	K	A	N	T
A	K	N	E	R	T	P	I	D
D	I	T	R	A	E	N	P	K
K	P	R	T	N	D	E	A	I
N	E	A	P	K	I	D	T	R
R	T	K	N	D	P	I	E	A
E	N	D	I	T	A	R	K	P
I	A	P	K	E	R	T	D	N

T	D	I	A	P	N	K	R	E
P	R	E	D	I	K	A	N	T
A	K	N	E	R	T	P	I	D
D	I	T	R	A	E	N	P	K
K	P	R	T	N	D	E	A	I
N	E	A	P	K	I	D	T	R
R	T	K	N	D	P	I	E	A
E	N	D	I	T	A	R	K	P
I	A	P	K	E	R	T	D	N

Difficulty:

Sudoku puzzle explanation

sudoku abc 9 -

ADEIKNPRT

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T	D	I	A	P	N	K	R	E
P	R	E	D	I	K	A	N	T
A	K	N	E	R	T	P	I	D
D	I	T	R	A	E	N	P	K
K	P	R	T	N	D	E	A	I
N	E	A	P	K	I	D	T	R
R	T	K	N	D	P	I	E	A
E	N	D	I	T	A	R	K	P
I	A	P	K	E	R	T	D	N