How to Write a Book in Haskell

R has a rich history. R is based on S, which is goes back to 1975. There's multiple object systems in R. It's the Perl lives already. And there's a lot of that orientation that has been forgotten to so far. If you come from a list background, for example, like the way there's three different, at least there's four different, some are extra will correct me on this but there's at least four different object systems,. I don't know, it's the S3 and the S4 objects.