_:b57039788	<http://www.w3.org/ns/oa#hasSource>	<http://ns.inria.fr/covid19/arg/1c8677db11d0984021120e5eddd2e765250deee3/24> .
_:b57039789	<http://www.w3.org/ns/oa#exact>	"mean difference" .
_:b57039788	<http://www.w3.org/ns/oa#hasSelector>	_:b57039789 .
_:b57039789	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/oa#TextQuoteSelector> .