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