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