SQL
x
use ruwiki_p;
select page_title from page as p1
where page_title like "%_(лекарственное_средство)"
and page_namespace = 0
and exists
(select * from page as p2
where p2.page_namespace = 0
and concat (p2.page_title, '_(лекарственное_средство)') = p1.page_title)
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