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