>> You just need to think of a question that will exactly split the
>> remaining outcomes in half each time.
>
> I think as long as there's *something* down either branch, you're OK. I
> don't think it has to split things in half.
I meant that to be able to recognise 2^20 things, you need to ask a question
at each step that will split the set in half. Otherwise you will end up not
having enough questions left to uniquely identify each item.
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