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