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