[R] how to concatenate factor vectors?

[Sam Steingold]

> * Bert Gunter <thagre.oregba at trar.pbz> [2012-10-17 23:21:44 -0700]:
>
> However, Is level "5" in 'a' the same as level "5" in 'b' ?

yes, of course.
would anyone want to _different_ factors with identical string representations?!

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