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