_:b57048844 <http://www.w3.org/ns/oa#hasSelector> _:b57048845 . _:b57048845 <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/ns/oa#TextQuoteSelector> . _:b57048844 <http://www.w3.org/ns/oa#hasSource> <http://ns.inria.fr/covid19/arg/8424309603c87c74ea5f3571c3ebc348cfcbb9e1/0> . _:b57048845 <http://www.w3.org/ns/oa#exact> "activity" .