| appearance as argument number 1 |
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| No TPTP formula. May not be expressible in strict first order. | Transportation.kif 2886-2886 | 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 12919-12919 | |
| No TPTP formula. May not be expressible in strict first order. | domainEnglishFormat.kif 12918-12918 | |
| No TPTP formula. May not be expressible in strict first order. | domainEnglishFormat.kif 12917-12917 |
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Sigma version 3.0 is open source software produced by Articulate Software and its partners