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