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