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