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an Entity references as follows:
A collection of collections. Each instance of PersonTypeByNationality is the collection of all people who are citizens of some country, or who are participants in its NationalCulture to some significant degree -- or else are instances of StatelessPerson. Instances include UnitedStatesPerson, FrenchPerson, and AustralianCitizenOrSubject. See also the first-order collection PersonWithNationality.