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