@prefix skos:	<http://www.w3.org/2004/02/skos/core#> .
@prefix isac:	<http://webisa.webdatacommons.org/concept/> .
isac:_angle_	skos:broader	isac:_protractor_ .
isac:_pencil_	skos:broader	isac:_protractor_ .
isac:only_tool_	skos:broader	isac:_protractor_ .