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