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