<http://webisa.webdatacommons.org/concept/problem_datum_>	<http://www.w3.org/2000/01/rdf-schema#label>	"problem datum" .
<http://webisa.webdatacommons.org/concept/problem_datum_>	<http://webisa.webdatacommons.org/ontology#hasPreModifier>	"problem" .
<http://webisa.webdatacommons.org/concept/problem_datum_>	<http://webisa.webdatacommons.org/ontology#hasHead>	"datum" .