It seems to me that rather than duplicate all non-first-lettered-words (nice hyphenate don't you think?), it actually discards all these words. I mean, the first list sorts all words which start with a small-case and the second list sorts all the first-upper-cased-words.

I would appreciate explanation.

Update: It seems that my pertinent and correct remark was voted down at least two times. I wonder what that means.