How many is "too many" with lists?

[Aahz Maruch]

In article <meh9-068C25.11551802052000 at news.cit.cornell.edu>,
Matthew Hirsch  <meh9 at cornell.edu> wrote:
>
>I'm building a list of lists each holding a combination of nCk where n 
>is the total number of numbers and k is the number you are choosing.  
>For example, I have 27 numbers, 0-26.  Looking at all combinations of 6 
>taken from this sample produces 27!/(27-6)!6! =296010 different 
>combinations stored in the original list.

So what's slow?  Generating the list or manipulating the list after it's
created?
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