<http://ns.inria.fr/covid19/PMC7222050#body_text>	<http://purl.org/dc/terms/subject>	"Aircraft first flown in 1991" .
<http://ns.inria.fr/covid19/PMC7222050#body_text>	<http://purl.org/dc/terms/subject>	"Phenoxazines" .
<http://ns.inria.fr/covid19/PMC7222050#body_text>	<http://purl.org/dc/terms/subject>	"Independent cities in the United States" .