<http://webisa.webdatacommons.org/prov/215555422>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/253785098> .
<http://webisa.webdatacommons.org/253785098>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/253785098>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<maplesoft.com> .
<http://webisa.webdatacommons.org/253785098>	<http://www.w3.org/ns/prov#value>	"??? If n is not given, the SelectFirst and SelectLast commands return the found element or NULL. Otherwise, if L is a list or rtable, a list is returned, and if L is a set, a set is returned." .