<http://ns.inria.fr/covid19/PMC7135325#body_text>	<http://purl.org/dc/terms/subject>	"21st-century Prime Ministers of the United Kingdom" .
<http://ns.inria.fr/covid19/PMC7135325#body_text>	<http://purl.org/dc/terms/subject>	"1789 establishments in the United States" .
<http://ns.inria.fr/covid19/PMC7135325#body_text>	<http://purl.org/dc/terms/subject>	"Social groups" .