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