Minimum 4 characters, letters and numbers only. Password is case-sensitive.
密码区分大小写，不能少于四个字符，只能使用字母和数字。
Passwords are case sensitive and must contain a minimum of 4 English characters.
密码区分大小写，至少包括四个英文字母。
Passwords are case sensitive and must contain a minimum of 4 English characters.
密码区分大小写，至少包括四个英文字母。
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