2
8
5
7
9
4
3
6
1
4
1
3
6
2
5
8
9
7
9
7
6
1
3
8
2
5
4
5
3
9
6
2
8
1
4
7
2
8
4
7
3
1
5
6
9
6
1
7
5
4
9
8
2
3
9
7
2
4
5
6
8
1
3
3
5
6
1
7
8
9
4
2
4
8
1
3
9
2
7
6
5
This Sudoku Puzzle has 28 steps and it is solved using Hidden Single, Naked Single, Full House techniques.
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