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