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