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