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