filter(mtcars, cyl == 8)
select(mtcars, mpg, cyl, hp:vs)
arrange(mtcars, cyl, disp)
mutate(mtcars, displ_l = disp / 61.0237)
summarise(mtcars, mean(disp))
summarise(group_by(mtcars, cyl), mean(disp))
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