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