https://w3id.org/framester/conceptnet5/data/en/mystery_writer <https://w3id.org/framester/conceptnet5/schema/IsA> <https://w3id.org/framester/conceptnet5/data/en/writer> <https://w3id.org/framester/conceptnet5/data/en/author_type_by_subject> risorse dalla linked data cloud