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