Some thougts on cartesian products

[Erik Max Francis]

Bryan Olson wrote:

> Christoph Zwerschke wrote:
> [...]
>> That may be the main problem to decide whether the cartesian product 
>> should return a generator or a list.
> 
> The Cartesion product is a set.

Sets are iterable, so that isn't an answer.  If it's a set, then it 
should either be a generator or a set.

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