_:b56986440	<http://www.w3.org/ns/oa#hasSelector>	_:b56986441 .
_:b56986441	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/oa#TextQuoteSelector> .
_:b56986441	<http://www.w3.org/ns/oa#exact>	"frequency" .
_:b56986440	<http://www.w3.org/ns/oa#hasSource>	<http://ns.inria.fr/covid19/arg/e1e16f7e22d04879de8412d4cb0f05d4419d8fc2/19> .