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