6.3E Given the following EER model for an electricity market: Location Name Manager R Contract ipe Haso ELECTRICITY PRODUCER ELECTRICITY RESELLER CUSTOMER Number of Employees POWER PLANT POWER PLANT LOCAL REGULATOR LOCATOR RESIDENTIAL BUSINESS Household GAS WIND NUCLEAR Number of pipelines Number of Number of reactors discuss some examples of semantics that cannot be enforced by the EER model; map the model to a relational model representation. Discuss the possible loss of semantics. Clearly indicate the primary-foreign key relationships and specify NOT NULL declarations where necessary