<http://ns.inria.fr/covid19/PMC7122081#body_text>	<http://purl.org/dc/terms/subject>	"Punjabi language" .
<http://ns.inria.fr/covid19/PMC7122081#body_text>	<http://purl.org/dc/terms/subject>	"Tonal languages in non-tonal families" .
<http://ns.inria.fr/covid19/PMC7122081#body_text>	<http://purl.org/dc/terms/subject>	"1834 in science" .