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