_:b57873900	<http://www.w3.org/ns/oa#hasSelector>	_:b57873901 .
_:b57873901	<http://www.w3.org/ns/oa#exact>	"frequency" .
_:b57873901	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/oa#TextQuoteSelector> .
_:b57873900	<http://www.w3.org/ns/oa#hasSource>	<http://ns.inria.fr/covid19/arg/caaafcc2e2cc9acc4ffaba47c540aa8694024df2/4> .