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