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