_:b57828408	<http://www.w3.org/ns/oa#hasSource>	<http://ns.inria.fr/covid19/arg/51421e94622c391902ad609d9bfaa85f533e20fe/2> .
_:b57828409	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/oa#TextQuoteSelector> .
_:b57828408	<http://www.w3.org/ns/oa#hasSelector>	_:b57828409 .
_:b57828409	<http://www.w3.org/ns/oa#exact>	"frequency" .