_:b57453621	<http://www.w3.org/ns/oa#exact>	"differentiation" .
_:b57453620	<http://www.w3.org/ns/oa#hasSource>	<http://ns.inria.fr/covid19/arg/131e6a035170ed5bd2dba6bec02649e9508a0c55/0> .
_:b57453621	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/oa#TextQuoteSelector> .
_:b57453620	<http://www.w3.org/ns/oa#hasSelector>	_:b57453621 .