> Don't even need to do that.
>
>  'pipe (endchar ?)',
>       'stem BST.',
>       '| l: lookup',
>       '?',
>       'stem VSE.',
>       '| l:',
>       '?',
>       'l:',
>       '| specs /T:/ 1 1-* next',
>       '| console'
>

And when your primary input does not have duplicates, you might also swap
the two streams (ie look for the VSE records not in BST)

  stem VSE. | l: lookup ? stem BST. | l: | cons

The reason you don't need the "hole" here is because "lookup" will continue
to do it's work as long as relevant streams are connected. We could
probably do a decent lecture on how eof propagates through the 12 streams
(there's a picture in the book).

---
Rob van der Heij
z/VM Development, CMS Pipelines

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