<http://ns.inria.fr/covid19/PMC7338192#body_text>	<http://purl.org/dc/terms/subject>	"Lattice theory" .
<http://ns.inria.fr/covid19/PMC7338192#body_text>	<http://purl.org/dc/terms/subject>	"Philosophical theories" .
<http://ns.inria.fr/covid19/PMC7338192#body_text>	<http://purl.org/dc/terms/subject>	"Closure operators" .
<http://ns.inria.fr/covid19/PMC7338192#body_text>	<http://purl.org/dc/terms/subject>	"1978 deaths" .