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involves a single entity type involves two entity types allows an occurrence of one entity type to be associated with several occurrences of another entity
involves a single entity type
involves two entity types
allows an occurrence of one entity type to be associated with several occurrences of another entity type
allows an occurrence of one entity type to be associated with several occurrences of another entity type and vice versa
allows an occurrence of one entity type to be associated with several occurrences of the same entity type
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