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