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