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