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