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