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The 7s make a skyscraper.
Rule out the 7s it removes.
3
9
6
2
4
8
4
9
7
8
6
3
6
7
8
3
7
9
2
9
6
3
7
3
9
8
4
7
2
6
6
3
2
9
7
6
8
3
1
5
7
6
9
8
3
2
8
3
7
6
Rule out 7
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