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