Union of http://hl7.org/fhir/ValueSet/program and http://hl7.org/fhir/ValueSet/program
This is the ValueSet that contains all the codes in Program (http://hl7.org/fhir/ValueSet/program) and Program (http://hl7.org/fhir/ValueSet/program). E.g. what you have to deal with if you get resources containing codes in either of them