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