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