en plutonium 239 (n)
― ExternalURL ⟶
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sw.opencyc.org /2012/05/10/concept/en/Plutonium_239 Source: OpenCyc 2012
en plutonium 239 (n, substance)
― ExternalURL ⟶
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wordnet-rdf.princeton.edu 114674315-n Source: Open Multilingual WordNet