?."?. doesn't do it.  My guess without testing, and some possible 
circumstantial justification for it not being a bug, would be $:






On Sunday, August 9, 2020, 08:29:08 p.m. EDT, Raul Miller 
<[email protected]> wrote: 





Well, technically:

  ?"? 8 8
0 4
  ? 8 8
6 2

I am not sure if that's the issue you were thinking of, but it matches
the words you used.

-- 
Raul

On Sun, Aug 9, 2020 at 10:37 AM Henry Rich <[email protected]> wrote:
>
> I know of one verb u for which it is true that u"u may produce a
> different result from u by itself.  (u"u means u applied at the rank of
> u, and [x] (u -: u"u) y would be a tautology except for this u.)
>
> What is the u?  Note that I am interested only in the results of u and
> u"u, not any side effects that might result from applying other
> operators to u.
>
> Henry Rich
>
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