_:b56281908 <http://www.w3.org/ns/oa#hasSource> <http://ns.inria.fr/covid19/arg/dff258238ea73df01556da00a99a5f8e75e121da/5> . _:b56281909 <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/ns/oa#TextQuoteSelector> . _:b56281909 <http://www.w3.org/ns/oa#exact> "medical mask" . _:b56281908 <http://www.w3.org/ns/oa#hasSelector> _:b56281909 .