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