<http://ns.inria.fr/covid19/PMC7217516#body_text>	<http://purl.org/dc/terms/subject>	"Differential equations" .
<http://ns.inria.fr/covid19/PMC7217516#body_text>	<http://purl.org/dc/terms/subject>	"Backward-compatible video game consoles" .
<http://ns.inria.fr/covid19/PMC7217516#body_text>	<http://purl.org/dc/terms/subject>	"Digital electronics" .