4
5
9
2
6
1
7
2
9
1
6
5
4
5
1
4
8
9
2
1
4
6
5
2
6
7
2
1
5
4
2
5
9
4
1
8
5
1
2
4
9
6
6
9
1
4
2
5
4
2
3
9
5
1
8
7
This Sudoku Puzzle has 25 steps and it is solved using Full House, Naked Single techniques.
Naked Single
Explanation
Full House
Explanation
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