[Mailman-Users] Subscribers of one list = subscribers of another?

[Mauricio Tavares]

	Let's say I have 3 lists, list1, list2, and list3.  Now I would
like to have the subscribers of list 3 to be those of list1 + list2. So,
when the list of subscribers in, say, list2 changes, list3 is
automagically updated.  Is there a way to do that?  I looked into what was
suggested on the bottom of http://starship.python.net/crew/jwt/mailman/,
but it seems to be aimed at accept_these_nonmembers. I actually even tried
it to do what I wanted but had no luck.