On Mon, Feb 10, 2020 at 1:21 PM Devon McCormick <[email protected]> wrote:
>    fls=. (whentry*.-.whdirs)#"|:fls
...
> Can someone explain or point me to the relevant documentation for "rank"?

   #"|:
#"_ 1 _

Which is unnecessary, because
   #"#
#"_ 1 _

Documentation at

https://www.jsoftware.com/help/dictionary/d600xv.htm

I hope this helps,

--
Raul
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