Is it possible to create a catlist that only shows posts that are included in two specific categories.
eg: Instead of [catlist id=18,19 orderby=title order=asc numberposts=-1 Date=no] which shows all posts from either Category 18 or 19, I would like something that only shows posts that are in BOTH category 18 AND 19, maybe something like [catlist id=18+19...
End result being that if a post is only in either 18 or 19 it will not be shown, but posts that are in both 18 and 19 will be shown.