必须以字母开头。
四到七个小写字母和字母数字字符，以字母开头。
Four to seven lowercase and alphanumeric characters, beginning with a letter.
对于那些还没有意识到这种不利条件的人来说，这指的是对那些姓氏以字母表下半部分的字母开头的人的歧视。
This, for those as yet unaware of such a disadvantage, refers to discrimination against those whose surnames begin with a letter in the lower half of the alphabet.
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