_:b57269888 <http://www.w3.org/ns/oa#hasSelector> _:b57269889 . _:b57269888 <http://www.w3.org/ns/oa#hasSource> <http://ns.inria.fr/covid19/arg/47171f29bd284855acc1d7d7b64afb0c2a3b84c7/1> . _:b57269889 <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/ns/oa#TextQuoteSelector> . _:b57269889 <http://www.w3.org/ns/oa#exact> "high risk" .