<http://ns.inria.fr/covid19/PMC7429516#body_text>	<http://purl.org/dc/terms/subject>	"Nitrogen(\u22123) compounds" .
<http://ns.inria.fr/covid19/PMC7429516#body_text>	<http://purl.org/dc/terms/subject>	"Trade unions" .
<http://ns.inria.fr/covid19/PMC7429516#body_text>	<http://purl.org/dc/terms/subject>	"Numerical software" .