I recommend at LEAST a mixture of Numbers, lowercase letters, and uppercase letters.
我建议至少是数字,小写字母和大写字母的混合。
A limitation of this technique is that it only calculates Numbers between 600 and 65,000 for the specified user name format of three lowercase letters followed by four digits.
该技术的一个限制是,对于三个小写字母加上四个数字的指定用户名格式,它仅计算600到65,000之间的编号。
The name of the package itself (not the filename, just the name of the package) can contain lowercase letters, Numbers, and the "-" and "+" characters.
软件包本身的名称(不是文件名,仅仅是软件包的名称)可以包含小写字母、数字以及“-”和“+”字符。
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