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add helpful explanation of mpg$drv
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R/data.R

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@@ -100,7 +100,7 @@
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#' \item{year}{year of manufacture}
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#' \item{cyl}{number of cylinders}
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#' \item{trans}{type of transmission}
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#' \item{drv}{f = front-wheel drive, r = rear wheel drive, 4 = 4wd}
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#' \item{drv}{the type of drive train, where f = front-wheel drive, r = rear wheel drive, 4 = 4wd}
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#' \item{cty}{city miles per gallon}
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#' \item{hwy}{highway miles per gallon}
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#' \item{fl}{fuel type}

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