While schools that function as professional learning communities do not look exactly alike, they do exhibit certain common characteristics. (advanc-ed.org)
Neo-Expressionism embraced a variety of different painting styles but which shared certain common characteristics. (visual-arts-cork.com)
«Set» implies there are certain common characteristics of the members, but people living in Europe 1,000 years ago had only one thing in common: living in Europe. (sciencenews.org)