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