6
1
7
8
3
5
5
8
1
4
3
3
5
6
8
1
9
6
7
5
1
2
8
8
5
2
1
4
3
9
2
1
3
9
8
5
7
6
4
8
2
1
9
5
3
2
4
5
7
8
1
6
1
8
5
9
3
6
Grid.......n 21
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