_:b57887180	<http://www.w3.org/ns/oa#hasSelector>	_:b57887181 .
_:b57887181	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/oa#TextQuoteSelector> .
_:b57887181	<http://www.w3.org/ns/oa#exact>	"frequencies" .
_:b57887180	<http://www.w3.org/ns/oa#hasSource>	<http://ns.inria.fr/covid19/arg/8111c472b27463ca0dfae56c5196eb4c92fdd14f/1> .