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