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