2
3
7
5
1
4
8
6
9
4
6
1
8
9
2
7
5
3
5
8
9
3
7
6
1
2
4
9
2
8
1
6
3
4
7
5
6
1
5
7
4
8
9
3
2
7
4
3
2
5
9
6
1
8
3
9
2
6
8
1
5
4
7
8
7
6
4
2
5
3
9
1
1
5
4
9
3
7
2
8
6
Given Values
-
Values found by backtracking