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