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