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Change "with a" to "that have" for clarity (#952) 

In the section 3.6 on Geometrical objects, I momentarily understood that it was saying that one line is describing the entirety of the values in the data-set through the 4 value. This is unlikely, due to the context, but it happened to me before realizing that wasn't the case. This small change could avoid that misunderstanding.
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data-visualize.Rmd
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@ -444,7 +444,7 @@ ggplot(data = mpg) +
``` ```
Here `geom_smooth()` separates the cars into three lines based on their `drv` value, which describes a car's drive train. Here `geom_smooth()` separates the cars into three lines based on their `drv` value, which describes a car's drive train.
One line describes all of the points with a `4` value, one line describes all of the points with an `f` value, and one line describes all of the points with an `r` value. One line describes all of the points that have a `4` value, one line describes all of the points that have an `f` value, and one line describes all of the points that have an `r` value.
Here, `4` stands for four-wheel drive, `f` for front-wheel drive, and `r` for rear-wheel drive. Here, `4` stands for four-wheel drive, `f` for front-wheel drive, and `r` for rear-wheel drive.
If this sounds strange, we can make it more clear by overlaying the lines on top of the raw data and then colouring everything according to `drv`. If this sounds strange, we can make it more clear by overlaying the lines on top of the raw data and then colouring everything according to `drv`.