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