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