https://w3id.org/framester/conceptnet5/data/en/varicose_vein <https://w3id.org/framester/conceptnet5/schema/InstanceOf> <https://w3id.org/framester/conceptnet5/data/en/disease> <https://w3id.org/framester/conceptnet5/schema/IsA> <https://w3id.org/framester/conceptnet5/data/en/illness> risorse dalla linked data cloud