Thank you Raul! I thought I was agreeing, until I got to the following:

> On Oct 14, 2019, at 11:40 AM, Raul Miller <[email protected]> wrote:
> 
> So ... it's the "only the nub" which is relevant here, if you do not
> care about the calculation which produces the result.

What calculation? What would be different if (I was allowed to) just supply 
(~.x) as a left argument? (Assuming I didn't care to waste the cycles 
calculating the nub when it, at least its size,  is going fall out as a result 
of looking up each of the eight argument rows).

But I'll accept that I'm missing something; the alternate that Roger suggested 
looks like it should do exactly what I was looking for. 

Thanks for your input!
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