6
4
5
2
8
1
9
7
3
7
2
9
5
3
4
8
1
6
3
8
1
7
6
9
5
2
4
3
2
4
5
6
8
7
1
9
9
5
7
3
4
1
6
8
2
8
1
6
2
9
7
4
3
5
8
5
7
4
9
2
1
3
6
1
9
3
1
6
5
2
7
8
6
4
2
1
7
3
9
4
5
This Sudoku Puzzle has 18 steps and it is solved using Naked Single, Full House techniques.
Naked Single
Explanation
Full House
Explanation
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