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