_:b56396729	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/oa#TextQuoteSelector> .
_:b56396728	<http://www.w3.org/ns/oa#hasSelector>	_:b56396729 .
_:b56396729	<http://www.w3.org/ns/oa#exact>	"placebo" .
_:b56396728	<http://www.w3.org/ns/oa#hasSource>	<http://ns.inria.fr/covid19/arg/29ead3f1e4f24c9158b65d37a4ba9d839fb9028c/3> .