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