@prefix skos:	<http://www.w3.org/2004/02/skos/core#> .
@prefix isac:	<http://webisa.webdatacommons.org/concept/> .
isac:_design_	skos:broader	isac:problem-solving_activity_ .
isac:_puzzle_	skos:broader	isac:problem-solving_activity_ .
isac:_science_	skos:broader	isac:problem-solving_activity_ .
isac:_game_	skos:broader	isac:problem-solving_activity_ .