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