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