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