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