_:b57057152	<http://www.w3.org/ns/oa#hasSelector>	_:b57057153 .
_:b57057153	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/oa#TextQuoteSelector> .
_:b57057153	<http://www.w3.org/ns/oa#exact>	"frequencies" .
_:b57057152	<http://www.w3.org/ns/oa#hasSource>	<http://ns.inria.fr/covid19/arg/3084c71cf822846f2913476c814ebe8d26b3caef/1> .