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