I was looking for an example of power being used for a binary search.  Is
there an example of this in a wiki or a list post?

So far I've ended up with the below, which works well, but originally I was
aiming at doing a binary search using symbols.  Probably there is a
crossover point where one outperforms the other.  I don't need this to be
super fast right now, but probably it's a good thing to know.

t=.s:'`zero`one`two`three`four`five'

{. I. ; t =/ s:'`three'   N.B. take first incase of duplicates.  Also, s:
returns a one item list, hence the need for /

thanks,
-Steven
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