Edge can be built interactively, but isn't in the chart

Here’s one related thread, and that’s probably the most focused one; there are more though that talk about lexical threading:

  1. regarding multiple adjunct extraction
  2. resumption in Nuuchanulth
  3. regarding multiple questions
  4. regarding QUE values

(and there were a couple more threads which mentioned lexical threading but looked more tangential.)