1
6
8
2
5
3
9
7
4
4
5
2
9
7
6
6
8
1
7
9
3
1
1
4
5
2
5
4
9
7
8
3
2
5
1
6
5
2
8
7
1
6
7
3
4
1
3
6
4
7
9
8
8
2
7
2
9
3
4
5
6
8
1
1
6
5
8
9
7
2
4
3
3
4
8
2
6
1
9
5
7
This Sudoku Puzzle has 18 steps and it is solved using Full House, Naked Single, Hidden Single techniques.
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