_:b56755105 <http://www.w3.org/ns/oa#exact> "frequency" . _:b56755104 <http://www.w3.org/ns/oa#hasSource> <http://ns.inria.fr/covid19/arg/b4cf5cba81dac5d3cf0683d83b056c1a4a0d04e1/1> . _:b56755105 <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/ns/oa#TextQuoteSelector> . _:b56755104 <http://www.w3.org/ns/oa#hasSelector> _:b56755105 .