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