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