About: http://webisa.webdatacommons.org/94106457

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Though abC and a are both formulas, all formulas other than a and b, end with C or N. So, abCa is not a formula, and thus neither is abCaN.
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com