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