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<speak>Dear all, <break strength="weak"/>Welcome. <break strength="strong"/> In this lecture <break strength="weak"/> we will start our discussion on entity-relationship diagram, or <say-as interpret-as="spell-out">ER</say-as> diagram, or <say-as interpret-as="spell-out">ERD</say-as><break strength="strong"/>. <say-as interpret-as="spell-out">ERD</say-as> will play an important role in the midterm exam and your project.<break strength="strong"/> We expect to spend two lectures <break strength="weak"/>on discussing <say-as interpret-as="spell-out">ERD</say-as>. </speak>