<http://webisa.webdatacommons.org/352249243>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/prov/377475075>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/352249243> .
<http://webisa.webdatacommons.org/352249243>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<racket-lang.org> .
<http://webisa.webdatacommons.org/352249243>	<http://www.w3.org/ns/prov#value>	"Contracts are a key tool for writing robust Racket programs." .