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