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