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