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