8
5
4
2
6
1
7
3
9
7
9
3
5
9
4
6
2
1
6
1
2
7
3
3
4
5
8
1
2
8
3
9
6
4
7
5
3
7
6
4
1
5
9
8
2
9
4
5
2
8
7
3
1
6
5
8
2
6
1
3
9
4
7
1
6
9
8
4
7
2
5
3
3
7
4
5
2
9
8
6
1
This Sudoku Puzzle has 21 steps and it is solved using Full House, Naked Single techniques.
Naked Single
Explanation
Full House
Explanation
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