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