The boolean AND queries are largely in enwiki (17607: ~3.5% overall, ~7.9% in enwiki), and they are a mixed bag, but many (626) appear with quot, and most (16657) are of the form 

"article_title_with_underscore" AND "article title without underscores"

where the first half is repeated over and over and the second half is something linked to in the first article. Find the source and add to the automata list.