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