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