| appearance as argument number 1 |
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| No TPTP formula. May not be expressible in strict first order. | People.kif 1183-1183 | Dutch reformed church is a subclass of Presbyterian church |
| appearance as argument number 2 |
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| No TPTP formula. May not be expressible in strict first order. | domainEnglishFormat.kif 64795-64795 |
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Sigma version 3.0 is open source software produced by Articulate Software and its partners