(atomicNumber Unnilpentium 105)	Mid-level-ontology.kif 29083-29083
(atomicNumber Unnilquadium 104)	Mid-level-ontology.kif 29066-29066
(atomicNumber Unnilseptium 107)	Mid-level-ontology.kif 29112-29112
(atomicNumber Uranium 92)	Mid-level-ontology.kif 28850-28850
(atomicNumber Vanadium 23)	Mid-level-ontology.kif 27625-27625
(atomicNumber Xenon 54)	Mid-level-ontology.kif 28149-28149
(atomicNumber Ytterbium 70)	Mid-level-ontology.kif 28455-28455
(atomicNumber Yttrium 39)	Mid-level-ontology.kif 27896-27896
(atomicNumber Zinc 30)	Mid-level-ontology.kif 27745-27745
(atomicNumber Zirconium 40)	Mid-level-ontology.kif 27913-27913

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Sigma version 3.0 is open source software produced by Articulate Software and its partners