<http://ns.inria.fr/covid19/PMC7315343#body_text>	<http://purl.org/dc/terms/subject>	"Trade unions" .
<http://ns.inria.fr/covid19/PMC7315343#body_text>	<http://purl.org/dc/terms/subject>	"Physical chemistry" .
<http://ns.inria.fr/covid19/PMC7315343#body_text>	<http://purl.org/dc/terms/subject>	"Populated places on Lake Ontario in Canada" .