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