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