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