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