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