_:b56853776 <http://www.w3.org/ns/oa#hasSelector> _:b56853777 . _:b56853776 <http://www.w3.org/ns/oa#hasSource> <http://ns.inria.fr/covid19/arg/db54b1a5c223be36b7381064f20d690920e83ddc/0> . _:b56853777 <http://www.w3.org/ns/oa#exact> "frequency" . _:b56853777 <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/ns/oa#TextQuoteSelector> .