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