_:b56441025 <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/ns/oa#TextQuoteSelector> . _:b56441025 <http://www.w3.org/ns/oa#exact> "frequency" . _:b56441024 <http://www.w3.org/ns/oa#hasSelector> _:b56441025 . _:b56441024 <http://www.w3.org/ns/oa#hasSource> <http://ns.inria.fr/covid19/arg/826c8c181124425f00147514506ebb207092360b/1> .