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