_:b57591220	<http://www.w3.org/ns/oa#hasSource>	<http://ns.inria.fr/covid19/arg/2b59b72c648e8a39f99b74719e621264c96b547f/1> .
_:b57591221	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/oa#TextQuoteSelector> .
_:b57591221	<http://www.w3.org/ns/oa#exact>	"grade" .
_:b57591220	<http://www.w3.org/ns/oa#hasSelector>	_:b57591221 .