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>Nothing; the first two lines provide the default values for 'prefix'
>and 'seen' (though you can provide 'prefix' if you want to).

Yes. Granted seen is an *optional* param, but what *is* it for and how *would* I use it?

Oh wait. I don't. It's a *system* param, used only for the recursion. 

Aahhhhh!


D.