https://w3id.org/framester/conceptnet5/data/en/unrequited.a <https://w3id.org/framester/conceptnet5/schema/RelatedTo> <https://w3id.org/framester/conceptnet5/data/en/return> <https://w3id.org/framester/conceptnet5/data/en/repay> <https://w3id.org/framester/conceptnet5/data/en/reciprocate> <https://w3id.org/framester/conceptnet5/data/en/unanswered> risorse dalla linked data cloud