https://w3id.org/framester/conceptnet5/data/en/unproductive <https://w3id.org/framester/conceptnet5/schema/EtymologicallyDerivedFrom> <https://w3id.org/framester/conceptnet5/data/en/un> <https://w3id.org/framester/conceptnet5/data/en/productive> risorse dalla linked data cloud