| appearance as argument number 2 |
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| No TPTP formula. May not be expressible in strict first order. | Mid-level-ontology.kif 25178-25178 | Iron is a subclass of house utility appliance |
| No TPTP formula. May not be expressible in strict first order. | domainEnglishFormat.kif 64995-64995 |
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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