_:b56501033 <http://www.w3.org/ns/oa#exact> "frequency" . _:b56501033 <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/ns/oa#TextQuoteSelector> . _:b56501032 <http://www.w3.org/ns/oa#hasSelector> _:b56501033 . _:b56501032 <http://www.w3.org/ns/oa#hasSource> <http://ns.inria.fr/covid19/arg/a995c4657065f1fc4c3d87cc8ea47755d502eeed/1> .