https://w3id.org/framester/conceptnet5/data/en/stiffener <https://w3id.org/framester/conceptnet5/schema/EtymologicallyDerivedFrom> <https://w3id.org/framester/conceptnet5/data/en/er> <https://w3id.org/framester/conceptnet5/data/en/stiffen> risorse dalla linked data cloud