8
9
2
6
3
7
4
1
5
1
4
3
2
5
9
7
6
8
5
7
6
8
4
1
2
9
3
5
7
3
2
6
4
9
8
1
4
8
1
5
9
7
3
2
6
6
2
9
1
3
8
4
5
7
1
2
8
3
5
6
7
4
9
9
3
4
8
7
2
6
1
5
7
6
5
9
1
4
3
8
2
This Sudoku Puzzle has 20 steps and it is solved using Naked Single, Full House techniques.
Naked Single
Explanation
Full House
Explanation
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