@interface HDUserDomainConceptCollapser : NSObject + (id)collapseUserDomainConcept:(id)a0 with:(id)a1 transaction:(id)a2 error:(id *)a3; + (BOOL)keepOldestConcept; + (id)mergeSubclassDataTo:(id)a0 fromDuplicateConcept:(id)a1; + (BOOL)preDeduplicationProcessingForUserDomainConcept:(id)a0 duplicateConcept:(id)a1 transaction:(id)a2 error:(id *)a3; + (BOOL)shouldDeleteDuplicateConcept; - (id)init; @end