_:b57351717	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/oa#TextQuoteSelector> .
_:b57351717	<http://www.w3.org/ns/oa#exact>	"knowledge mastery" .
_:b57351716	<http://www.w3.org/ns/oa#hasSource>	<http://ns.inria.fr/covid19/arg/a1a2e0f27b8683b9d2462bc2af08d20b29243f28/1> .
_:b57351716	<http://www.w3.org/ns/oa#hasSelector>	_:b57351717 .
_:b57351717	<http://www.w3.org/ns/oa#exact>	"knowledge" .