Fixes #496
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		@@ -869,7 +869,7 @@ Functions that work most naturally in grouped mutates and filters are known as
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### Exercises
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1.  Refer back to the table of useful mutate and filtering functions. 
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1.  Refer back to the lists of useful mutate and filtering functions. 
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    Describe how each operation changes when you combine it with grouping.
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1.  Which plane (`tailnum`) has the worst on-time record?
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