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