| appearance as argument number 1 |
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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 |
| appearance as argument number 2 |
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| No TPTP formula. May not be expressible in strict first order. | Geography.kif 6869-6869 | Soil salinity issue is a subattribute of soil degradation issue |
| No TPTP formula. May not be expressible in strict first order. | domainEnglishFormat.kif 53768-53768 | |
| No TPTP formula. May not be expressible in strict first order. | domainEnglishFormat.kif 53767-53767 | |
| No TPTP formula. May not be expressible in strict first order. | domainEnglishFormat.kif 53766-53766 |
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Sigma version 3.0 is open source software produced by Articulate Software and its partners