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