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