| appearance as argument number 1 |
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| No TPTP formula. May not be expressible in strict first order. | Economy.kif 5356-5356 | |
| No TPTP formula. May not be expressible in strict first order. | Economy.kif 5355-5355 | PoplarWood 是 Hardwood 的 subclass |
| appearance as argument number 2 |
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| No TPTP formula. May not be expressible in strict first order. | Geography.kif 6513-6513 | PoplarTree 和 PoplarWood 是 内部相关 |
| No TPTP formula. May not be expressible in strict first order. | domainEnglishFormat.kif 65339-65339 |
| antecedent |
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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