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