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