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