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