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