@prefix skos:	<http://www.w3.org/2004/02/skos/core#> .
@prefix isac:	<http://webisa.webdatacommons.org/concept/> .
isac:_here_	skos:broader	isac:unit_vector_ .
isac:normal_vector_	skos:broader	isac:unit_vector_ .
isac:_direction_	skos:broader	isac:unit_vector_ .
isac:_j_	skos:broader	isac:unit_vector_ .