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