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