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Identify use cases of an email system with functionalities of new messages, searching email by key words from title, forward email, reply email, save draft,

Identify use cases of an email system with functionalities of new messages, searching email by key words from

title, forward email, reply email, save draft, and delete email. Draw a class diagram of one use case and a state

diagram of one of the classes. $($ Note: your state diagram must be meaningful and has significant state transitions. $)$

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