| appearance as argument number 1 |
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| No TPTP formula. May not be expressible in strict first order. | ComputingBrands.kif 211-211 | Apple mac oS system2 is a subclass of Mac OS |
| appearance as argument number 2 |
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| No TPTP formula. May not be expressible in strict first order. | domainEnglishFormat.kif 64460-64460 |
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Sigma web home Suggested Upper Merged Ontology (SUMO) web home
Sigma version 3.0 is open source software produced by Articulate Software and its partners