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