This is the ValueSet that contains all the codes in BR Grau Certeza Alergias Reacoes Adversas (https://terminologia.saude.gov.br/fhir/ValueSet/BRGrauCertezaAlergiasReacoesAdversas) and BR Grau Certeza Alergias Reacoes Adversas (https://terminologia.saude.gov.br/fhir/ValueSet/BRGrauCertezaAlergiasReacoesAdversas). E.g. what you have to deal with if you get resources containing codes in either of them