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