_:vb50791909	<http://www.w3.org/ns/r2rml#column>	"IsChallengeReversed" .
_:vb50791909	<http://www.w3.org/ns/r2rml#datatype>	<http://www.w3.org/2001/XMLSchema#boolean> .
_:vb50791909	<http://www.openlinksw.com/schemas/virtrdf#bnode-row>	"42" .