[John Henry]
> If I have a bunch of sets:
>> a = set((1, 2, 3))
> b = set((2, 3))
> c = set((1, 3))
> ....
>> What's the cleanest way to say:
>> 1) Give me a list of the items that are in all of the sets? (3 in the
> above example)
list(a & b & c)
> 2) Give me a list of the items that are not in all of the sets? (1,2 in
> the above example)
list((a | b | c) - (a & b & c))
