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