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