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