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