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