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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	Since id is a non-terminal we expand that instead of moving on to op. id only has one production: id ??? a | b | c.
http://www.w3.org/ns/prov#wasQuotedFrom	dreamincode.net