Only Chen Notation and please use E-R Diagram.

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Consider a mail order database in which employees take orders for parts from customers. The data requirements are summarized as follows: The mail order company has employees identified by a unique employee number, their first and last names, and a zip code where they are located. The customers of the company are identified by a unique customer number. In addition their first and last names, and a zip code where they are located are recorded. The parts being sold by the company are identified by a unique part number. In addition a part name, their price, and quantity in stock are recorded. Orders placed by customers are taken by employees and are given a unique order number. Each order may contain certain quantities of one or more parts and their received date as well as a shipped date is recorded