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