<http://ns.inria.fr/covid19/PMC7354798#title>	<http://purl.org/dc/terms/subject>	"Port cities in the Caribbean" .
<http://ns.inria.fr/covid19/PMC7354798#title>	<http://purl.org/dc/terms/subject>	"Educational stages" .
<http://ns.inria.fr/covid19/PMC7354798#title>	<http://purl.org/dc/terms/subject>	"Spanish-speaking countries and territories" .