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