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Using Latex and the beamer class, I would like to highlight code snippets. Does anybody know a suitable 'preprocessor' or 'filter' for R (and/or C/C++) code ? I have been including it in simple \begin{verbatim} ... \end{verbatim} and I know there is a better way -- in fact I saw it used a while back in some package I looked at. And I didn't write that down... What I am