Sets are named many-to-many CXU groupings, and the UNIVERSAL set is always in scope so that CXUs can be organized into reusable scoped collections.

**Sets:** Named many-to-many CXU groupings; UNIVERSAL set always in scope

— PYRANA_PLATFORM_ARCHITECTURE_REFERENCE.md

Named many-to-many CXU groupings

— PYRANA_PLATFORM_ARCHITECTURE_REFERENCE.md

UNIVERSAL set always in scope

— PYRANA_PLATFORM_ARCHITECTURE_REFERENCE.md