4
8
7
1
5
2
6
9
3
6
2
9
8
3
7
1
4
5
5
1
3
9
4
6
8
2
7
9
2
4
9
6
5
3
7
1
7
1
8
4
8
2
5
9
6
6
5
4
7
3
1
4
8
2
5
4
9
2
1
8
7
3
8
2
6
3
9
7
4
9
5
1
1
7
8
3
6
5
2
6
4
This Sudoku Puzzle has 25 steps and it is solved using Full House, Naked Single, Hidden Single techniques.
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