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