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