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