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