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