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