Remove duplicates in a sequence?

[Daniel T.]

I have a sequence that contains strings, and I want to remove any
duplicates. I know how to write a function to do it, but I was wondering
if there was already one in the language or a library that does it.

I've looked in the docs for "unique" and "remove" but no luck... Can
anyone help me?

-- 
When a thing ceases to be a subject of controversy,
it ceases to be a subject of interest.
                                                   -- William Hazlitt