_:b56725493 <http://www.w3.org/ns/oa#exact> "frequency" . _:b56725492 <http://www.w3.org/ns/oa#hasSource> <http://ns.inria.fr/covid19/arg/861331c3e2e02fc2ad37835a72e81dd2750193df/0> . _:b56725492 <http://www.w3.org/ns/oa#hasSelector> _:b56725493 . _:b56725493 <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/ns/oa#TextQuoteSelector> .