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