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On Thu, 06 Dec 2007 23:38:41 +0100, David Kastrup wrote:

> You can try
> 
> (apply '+ 4 3 (append foo bar))
> 
> Which is not necessarily terribly efficient but should work.

And it does work! Thank you. Even if the copying is inefficient (I assume 
that's the inefficient part), I don't imagine there's any way to carve up 
lists like this without copying something.