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