| appearance as argument number 1 |
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| No TPTP formula. May not be expressible in strict first order. | Geography.kif 6514-6514 | |
| No TPTP formula. May not be expressible in strict first order. | Geography.kif 6513-6513 | Poplar tree is internally related to Poplar wood |
| No TPTP formula. May not be expressible in strict first order. | Geography.kif 6512-6512 | Poplar tree is a subclass of deciduous tree |
| appearance as argument number 2 |
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| No TPTP formula. May not be expressible in strict first order. | domainEnglishFormat.kif 65338-65338 |
| consequent |
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| No TPTP formula. May not be expressible in strict first order. | Economy.kif 5358-5363 |
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Sigma version 3.0 is open source software produced by Articulate Software and its partners