do(3) * rnorm(1)
do(3) * "hello"
do(3) * lm(shuffle(height) ~ sex + mother, Galton)
do(3) * summary(lm(shuffle(height) ~ sex + mother, Galton))
do(3) * 1:4
do(3) * mean(rnorm(25))
do(3) * c(mean = mean(rnorm(25)))
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