| appearance as argument number 1 |
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| No TPTP formula. May not be expressible in strict first order. | Transportation.kif 2214-2214 | PCC car is a subclass of streetcar |
| appearance as argument number 2 |
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| No TPTP formula. May not be expressible in strict first order. | domainEnglishFormat.kif 44892-44892 | |
| No TPTP formula. May not be expressible in strict first order. | domainEnglishFormat.kif 44891-44891 | |
| No TPTP formula. May not be expressible in strict first order. | domainEnglishFormat.kif 44890-44890 |
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Sigma version 3.0 is open source software produced by Articulate Software and its partners