Nothing
mpg_labels <- list(
model = "model name",
displ = "engine displacement, in litres",
year = "year of manufacture",
cyl = "number of cylinders",
trans = "type of transmission",
drv = "front / rear / 4-wheel drive",
cty = "city miles per gallon",
hwy = "highway miles per gallon",
fl = "fuel type",
class = "type of car"
)
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