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