fixing typo
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@@ -394,7 +394,7 @@ This function works similarly to the `select` argument in `base::subset()`. Beca
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### Exericses
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### Exercises
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1. Brainstorm as many ways as possible to select `dep_time`, `dep_delay`,
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1. Brainstorm as many ways as possible to select `dep_time`, `dep_delay`,
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`arr_time`, and `arr_delay` from `flights`.
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`arr_time`, and `arr_delay` from `flights`.
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