(Possibly?) little-known fact: It's possible to use $ListBuild on the left hand side of the equals sign in a set command to extract multiple list values at once:
See for reference: http://docs.intersystems.com/cache20152/csp/docbook/DocBook.UI.Page.cls?...
This feature was news to me - I use $ListBuild lists a lot but hadn't come across it until today. Had anyone else encountered this?