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