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