This is the ValueSet that contains all the codes in Sequence Phase Relationships (http://hl7.org/fhir/uv/genomics-reporting/ValueSet/sequence-phase-relationship-vs) and Sequence Phase Relationships (http://hl7.org/fhir/uv/genomics-reporting/ValueSet/sequence-phase-relationship-vs). E.g. what you have to deal with if you get resources containing codes in either of them