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