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