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