用户名为空，密码不为空。
An empty value for user name and a non-empty value for password.
一旦有密码系统安装，斯托曼就将它破解，然后设为空密码并发邮件告诉同事们。
When a password system was installed, Stallman broke it down, resetting passwords to null strings, then sent users messages informing them of the removal of the password system.
密码为空。
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