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