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