(I thought I posted this last night, but don't see it now.  Apologies if it 
is a duplicate.)

Thanks everyone for the discussion, and to Mike for the Set(list()) 
incantation.  It looks like that will preserve the ordering on the output 
and I will not need to edit a long string of subsequent doctests.

On Tuesday, October 29, 2013 3:36:30 AM UTC-7, vdelecroix wrote:
>
> Why is a set partition not a set of sets ? 
>

My sentiment exactly.  A newbie must first get over being returned an 
iterator (which is a good feature of the combinatorics routines).  But then 
I'd hope that a request for objects that are sets would fully behave as 
sets, without further conversions.

Rob 

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