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What are the concrete classes?

The four concrete string classes that satisfy most needs are:
- nsString the general purpose heap-based workhorse
- nsAutoString the short-lived stack-based temporary
- nsXPIDLString management for C-interface strings
- NS_LITERAL_STRING an efficient wrapper for constant literal strings in source

and the less commonly used:
- nsDependentString a wrapper for non-literal character buffers

You'll see other classes when you look through the source, but they are mostly implementation details.

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What are the concrete classes?