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