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