<http://ns.inria.fr/covid19/PMC2740835#body_text>	<http://purl.org/dc/terms/subject>	"Problem solving methods" .
<http://ns.inria.fr/covid19/PMC2740835#body_text>	<http://purl.org/dc/terms/subject>	"Sports clubs established in the 1780s" .
<http://ns.inria.fr/covid19/PMC2740835#body_text>	<http://purl.org/dc/terms/subject>	"Lists of countries" .