p <- ggplot(mtcars) + geom_point(aes(x = wt, y = mpg,
colour = factor(gear))) + facet_wrap(~am)
p
p + theme_gray()
p + theme_bw()
p + theme_linedraw()
p + theme_light()
p + theme_dark()
p + theme_minimal()
p + theme_classic()
p + theme_void()
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