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