def self.disjoint_taxon_name_relationships
    self.parent.disjoint_taxon_name_relationships +
        self.collect_to_s(TaxonNameRelationship::Iczn::Invalidating::Synonym::Suppression,
            TaxonNameRelationship::Iczn::Invalidating::Synonym::Suppression::Conditional,
            TaxonNameRelationship::Iczn::Invalidating::Synonym::Suppression::Total)