<http://ns.inria.fr/covid19/PMC7274683#body_text>	<http://purl.org/dc/terms/subject>	"Azerbaijani inventions" .
<http://ns.inria.fr/covid19/PMC7274683#body_text>	<http://purl.org/dc/terms/subject>	"Fuzzy logic" .
<http://ns.inria.fr/covid19/PMC7274683#body_text>	<http://purl.org/dc/terms/subject>	"Geometry" .
<http://ns.inria.fr/covid19/PMC7274683#body_text>	<http://purl.org/dc/terms/subject>	"Iranian inventions" .
<http://ns.inria.fr/covid19/PMC7274683#body_text>	<http://purl.org/dc/terms/subject>	"Digital geometry" .
<http://ns.inria.fr/covid19/PMC7274683#body_text>	<http://purl.org/dc/terms/subject>	"Closure operators" .
<http://ns.inria.fr/covid19/PMC7274683#body_text>	<http://purl.org/dc/terms/subject>	"Systems of set theory" .