_:b56457645	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/oa#TextQuoteSelector> .
_:b56457645	<http://www.w3.org/ns/oa#exact>	"urea nitrogen" .
_:b56457644	<http://www.w3.org/ns/oa#hasSelector>	_:b56457645 .
_:b56457644	<http://www.w3.org/ns/oa#hasSource>	<http://ns.inria.fr/covid19/arg/697ed1b5ce6fda0e877550967f762bd6f29d00b7/2> .