_:b57921617	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/oa#TextQuoteSelector> .
_:b57921616	<http://www.w3.org/ns/oa#hasSource>	<http://ns.inria.fr/covid19/arg/2427201a753007c934d3c27d4d686fcef26e952c/1> .
_:b57921616	<http://www.w3.org/ns/oa#hasSelector>	_:b57921617 .
_:b57921617	<http://www.w3.org/ns/oa#exact>	"obstruction" .