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Each customer is described by a unique customer number, a customer name, an address, and a postal code. Addresses are organized such that each address

Each customer is described by a unique customer number, a customer name, an
address, and a postal code. Addresses are organized such that each address is
associated to one postal code. A customer owns many different type of credit card,
such as Visa or Master, and each credit card is described by a credit card number,
a credit card type, and an expiry date. The information described are stored in a
relational table CustomerCreditCard as shown here:

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