| appearance as argument number 1 |
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| No TPTP formula. May not be expressible in strict first order. | Geography.kif 6826-6826 | Soil quality issue is a subclass of environmental issue |
| appearance as argument number 2 |
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| No TPTP formula. May not be expressible in strict first order. | Geography.kif 6828-6828 | Soil degradation issue is an instance of soil quality issue |
| No TPTP formula. May not be expressible in strict first order. | Geography.kif 6827-6827 | Soil erosion issue is an instance of soil quality issue |
| No TPTP formula. May not be expressible in strict first order. | Geography.kif 6829-6829 | Soil exhaustion issue is an instance of soil quality issue |
| No TPTP formula. May not be expressible in strict first order. | Geography.kif 6837-6837 | Soil pollution issue is an instance of soil quality issue |
| No TPTP formula. May not be expressible in strict first order. | domainEnglishFormat.kif 53804-53804 | |
| No TPTP formula. May not be expressible in strict first order. | domainEnglishFormat.kif 53803-53803 | |
| No TPTP formula. May not be expressible in strict first order. | domainEnglishFormat.kif 53802-53802 |
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Sigma version 3.0 is open source software produced by Articulate Software and its partners