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