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