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