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