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