This is the ValueSet that contains all the codes in Semantic Drug Form Group Codes (http://hl7.org/fhir/us/davinci-drug-formulary/ValueSet/SemanticDrugFormGroupVS) and Semantic Drug Form Group Codes (http://hl7.org/fhir/us/davinci-drug-formulary/ValueSet/SemanticDrugFormGroupVS). E.g. what you have to deal with if you get resources containing codes in either of them