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