[W6.4D][W09-B1] Wee Jia Sheng Richardson #759
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AddCommand.java, ClearCommand.java, DeleteCommand.java: isMutating() return true ExitCommand.java, FindCommand.java, HelpCommand.java, IncorrectCommand.java, ListCommand.java, ViewAllCommand.java, ViewCommand.java: isMutating() return false
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Exercise in [Addressbook-Level3: LO-Polymorphism]