| appearance as argument number 1 |
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| No TPTP formula. May not be expressible in strict first order. | Economy.kif 1920-1920 | Zinc ore is an industry product type of zinc ore mining |
| No TPTP formula. May not be expressible in strict first order. | Economy.kif 1919-1919 | Zinc ore mining is a subattribute of lead ore and zinc ore mining |
| No TPTP formula. May not be expressible in strict first order. | Economy.kif 1915-1915 | Zinc ore mining is a subattribute of zinc industry |
| appearance as argument number 2 |
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| No TPTP formula. May not be expressible in strict first order. | domainEnglishFormat.kif 64201-64201 | |
| No TPTP formula. May not be expressible in strict first order. | domainEnglishFormat.kif 64200-64200 | |
| No TPTP formula. May not be expressible in strict first order. | domainEnglishFormat.kif 64199-64199 |
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Sigma version 3.0 is open source software produced by Articulate Software and its partners