7
8
1
2
9
6
5
4
3
5
2
4
3
8
1
6
9
7
6
3
9
7
4
5
8
2
1
4
5
2
3
6
9
1
7
8
9
7
8
1
4
5
2
6
3
3
1
6
2
8
7
9
5
4
9
4
6
6
2
7
8
1
5
7
1
2
4
5
4
4
3
6
5
6
3
1
9
8
4
7
2
This Sudoku Puzzle has 20 steps and it is solved using Full House, Naked Single, Hidden Single techniques.
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