| appearance as argument number 1 |
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| No TPTP formula. May not be expressible in strict first order. | Geography.kif 6486-6487 | |
| No TPTP formula. May not be expressible in strict first order. | Geography.kif 6485-6485 | Beech tree is internally related to Beech wood |
| No TPTP formula. May not be expressible in strict first order. | Geography.kif 6484-6484 | Beech 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 64531-64531 |
| consequent |
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| No TPTP formula. May not be expressible in strict first order. | Economy.kif 5306-5311 |
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Sigma version 3.0 is open source software produced by Articulate Software and its partners