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