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