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