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