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