<http://ns.inria.fr/covid19/PMC7149522#body_text>	<http://purl.org/dc/terms/subject>	"Trade unions" .
<http://ns.inria.fr/covid19/PMC7149522#body_text>	<http://purl.org/dc/terms/subject>	"Populated places on Lake Ontario in Canada" .
<http://ns.inria.fr/covid19/PMC7149522#body_text>	<http://purl.org/dc/terms/subject>	"Laboratories" .