A username must with a ;etter and consist of letters
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A username must with a ;etter and consist of letters
A username must with a ;etter and consist of letters
A username must with a ;etter and consist of letters
用户名必须得字母和字母组成?
用户名必须是一个字母或一串字母组成
用户名必须由字符和字符串组成