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