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