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