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