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