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