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