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