[R] Request update on A (Not So) Short Introduction to S4

[Uwe Ligges]

Peng Yu wrote:
> There are several '?'s on the last page of the following document.
> Apparently, they are not correct. Could somebody correct it?
> 
> cran.r-project.org/doc/contrib/Genolini-S4tutorialV0-5en.pdf


Please ask the author.

Best,
Uwe Ligges


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