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