_:b57516581	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/oa#TextQuoteSelector> .
_:b57516580	<http://www.w3.org/ns/oa#hasSource>	<http://ns.inria.fr/covid19/arg/df02a6588a33458e8f0fd88ffab7405113dd3d91/0> .
_:b57516580	<http://www.w3.org/ns/oa#hasSelector>	_:b57516581 .
_:b57516581	<http://www.w3.org/ns/oa#exact>	"digestive symptoms" .