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.NET Framework error in Português (Portuguese):

Todos os objetos do EntitySet '{0}' devem ter chaves primárias exclusivas. Entretanto, uma instância de tipo '{1}' e uma instância de tipo '{2}' têm o mesmo valor de chave primária, '{3}'.

English translation: All objects in the EntitySet '{0}' must have unique primary keys. However, an instance of type '{1}' and an instance of type '{2}' both have the same primary key value, '{3}'.

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