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Update relational-data.Rmd (#759)

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@ -29,7 +29,7 @@ library(nycflights13)
## nycflights13 {#nycflights13-relational}
We will use the nycflights13 package to learn about relational data. nycflights13 contains four tibbles that are related to the `flights` table that you used in [data transformation]:
We will use the nycflights13 package to learn about relational data. nycflights13 contains five tibbles : `airlines`, `airports`, `weather` and `planes` which are all related to the `flights` table that you used in [data transformation]:
* `airlines` lets you look up the full carrier name from its abbreviated
code: