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