MattM wrote:

> and of course there's no fixed number of questions, they can be different at
> every level so you have many many many more permutations. Or is it just
> fortunate that I've always picked something of that list! ;)

Au contrare... If 20 questions will be asked yielding 20 yes/no answers, 
than 2^20 things can be distinguished. The fact that the questions on 
one branch may or may not be the same as the ones on another branch is 
irrelevant. There are still the same number of branches. [Although 
obviously as a *practical* matter being able to have more relevent 
quenstions on the different branches helps a lot.]

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