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