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the solution:
2
9
4
5
8
1
6
7
3
6
7
8
2
3
9
4
1
5
3
1
5
4
7
6
9
2
8
9
5
2
1
6
3
8
4
7
8
6
1
7
2
4
5
3
9
4
3
7
8
9
5
2
6
1
1
2
3
9
4
8
7
5
6
7
8
6
3
5
2
1
9
4
5
4
9
6
1
7
3
8
2