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clarity -> cyl (#243) 

I think the concept is easier to understand by staying consistent with the `mpg` dataset, there's probably no need to introduce a new dataset for that remark only.
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Etienne B. Racine 2016-08-09 12:15:19 -04:00 committed by Hadley Wickham
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visualize.Rmd
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@ -249,7 +249,7 @@ ggplot(data = mpg) +
facet_grid(drv ~ cyl)
```
If you prefer to not facet in the rows or columns dimension, use a `.` instead of a variable name, e.g. `+ facet_grid(. ~ clarity)`.
If you prefer to not facet in the rows or columns dimension, use a `.` instead of a variable name, e.g. `+ facet_grid(. ~ cyl)`.
### Exercises