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