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