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