_:b56521021	<http://www.w3.org/ns/oa#exact>	"contact frequency" .
_:b56521020	<http://www.w3.org/ns/oa#hasSource>	<http://ns.inria.fr/covid19/arg/c5cd3b3a3428d350252c5c78cb357d36ebd13046/2> .
_:b56521020	<http://www.w3.org/ns/oa#hasSelector>	_:b56521021 .
_:b56521021	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/oa#TextQuoteSelector> .