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The lookup operation is best used to obtain details about a single concept
Expand returns a Valueset Resource (ie a collection of concepts). This could hat could contain an entire CodeSystem.
See list of FHIR SNOMED CT properties that can be requested for a concept are here.
This includes all descendants of 410662002 |Concept model attribute|. Note that this would include both defining and non-defining relationships.
List of filters used to create implicit Valusets can be found here.