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