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