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