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