<http://webisa.webdatacommons.org/49676329>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/prov/145602221>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/49676329> .
<http://webisa.webdatacommons.org/49676329>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<harvard.edu> .
<http://webisa.webdatacommons.org/49676329>	<http://www.w3.org/ns/prov#value>	"communication between many types of programs (e.g., Unix, X, Tcl/Tk)" .