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