https://w3id.org/framester/conceptnet5/cla/la.gravis.a <https://w3id.org/framester/conceptnet5/schema/RelatedTo> <https://w3id.org/framester/conceptnet5/data/en/heavy> <https://w3id.org/framester/conceptnet5/data/en/hard> <https://w3id.org/framester/conceptnet5/data/en/grave> <https://w3id.org/framester/conceptnet5/data/en/serious> <https://w3id.org/framester/conceptnet5/data/en/troublesome> risorse dalla linked data cloud