| appearance as argument number 1 |
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| No TPTP formula. May not be expressible in strict first order. | Transportation.kif 3492-3492 | Canal system is a subclass of water transportation system |
| appearance as argument number 2 |
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| No TPTP formula. May not be expressible in strict first order. | domainEnglishFormat.kif 12934-12934 | |
| No TPTP formula. May not be expressible in strict first order. | domainEnglishFormat.kif 12933-12933 | |
| No TPTP formula. May not be expressible in strict first order. | domainEnglishFormat.kif 12932-12932 |
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Sigma version 3.0 is open source software produced by Articulate Software and its partners