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