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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def system(self) -> 'EFBChat': """ Set the chat as a system chat. Only set for channel-level and group-level system chats. Returns: EFBChat: This object. """

        self.chat_name = "System"
        self.chat_alias = None
        self.chat_uid = EFBChat.SYSTEM_ID
        self.chat_type = ChatType.System
        return self