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