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