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