_:b57813309	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/oa#TextQuoteSelector> .
_:b57813308	<http://www.w3.org/ns/oa#hasSelector>	_:b57813309 .
_:b57813309	<http://www.w3.org/ns/oa#exact>	"frequency" .
_:b57813308	<http://www.w3.org/ns/oa#hasSource>	<http://ns.inria.fr/covid19/arg/1405f2b5d4842d8aab566a028962171796dcdb51/2> .