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R Markdown with the Docco Classic Style

x = readLines('docco-linear.Rmd')[-(1:7)]
x = gsub('linear', 'classic', x)
i = grep('^knit2html[(][.]{3}', x)
x[i - 1] = '```{r}'
x[i] = 'head(knitr::rocco, 5)'
cat(knit_child(text = x, quiet = TRUE), sep = '\n')

You probably have noticed that you can adjust the widths of the two columns using your cursor. What is more, press T on your keyboard, and see what happens.