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