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