They were social arrangements of necessity rather than choice. (nreionline.com)
«The peculiar institution» of slavery and immigration during the 18th century created a city that, even in 1961, was a complex social arrangement, one that remains palpable today. (contemporaryartdaily.com)
Nor can we predict triple - sex sexual, parental, or larger - scale social arrangements with any confidence. (discovermagazine.com)