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