1
9
2
5
5
4
8
3
6
3
7
4
1
8
6
9
2
5
6
5
8
2
9
3
4
7
1
9
2
8
4
7
3
6
5
1
5
6
7
8
1
9
4
3
2
1
3
4
5
2
6
9
8
7
7
6
8
3
4
5
2
1
9
2
5
1
6
9
8
7
4
3
3
4
9
7
1
2
8
6
5
This Sudoku Puzzle has 31 steps and it is solved using Naked Single, Full House, Hidden Single techniques.
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