_:b56618368 <http://www.w3.org/ns/oa#hasSelector> _:b56618369 . _:b56618369 <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/ns/oa#TextQuoteSelector> . _:b56618369 <http://www.w3.org/ns/oa#exact> "retention" . _:b56618368 <http://www.w3.org/ns/oa#hasSource> <http://ns.inria.fr/covid19/arg/29f4b1cf4f2cd89851d3b78e6e812fe035030424/48> .