| appearance as argument number 1 |
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| No TPTP formula. May not be expressible in strict first order. | Geography.kif 6491-6492 | |
| No TPTP formula. May not be expressible in strict first order. | Geography.kif 6490-6490 | BirchTree 和 BirchWood 是 内部相关 |
| No TPTP formula. May not be expressible in strict first order. | Geography.kif 6489-6489 | BirchTree 是 DeciduousTree 的 subclass |
| appearance as argument number 2 |
|
|
| No TPTP formula. May not be expressible in strict first order. | domainEnglishFormat.kif 64539-64539 |
| consequent |
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| No TPTP formula. May not be expressible in strict first order. | Economy.kif 5316-5321 |
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Sigma version 3.0 is open source software produced by Articulate Software and its partners