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The message types of shift change can be divided into four types: notice in the station, private message, shift change message and shift change message. In-station notification is usually a notification sent by the shift server to the user's mobile phone client or computer client, including system notification, class notification and in-station service notification. Private message is a one-to-one message exchange between users, similar to the private message function of e-mail. E-mail message is a unique message type of E-class, which can be sent among friends of E-class, similar to the function of short message. Easy lesson message is a group message function of easy lesson, which is usually used for class notification, homework reminder and so on.

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