fix typo (#1150)
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@ -595,7 +595,7 @@ While our examples have mostly focused on dplyr, tidy evaluation also underpins
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### Exercises
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### Exercises
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1. Using the datasets from nyclights13, write functions that:
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1. Using the datasets from nycflights13, write functions that:
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1. Find all flights that were cancelled (i.e. `is.na(arr_time)`) or delayed by more than an hour.
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1. Find all flights that were cancelled (i.e. `is.na(arr_time)`) or delayed by more than an hour.
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