| appearance as argument number 1 |
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| No TPTP formula. May not be expressible in strict first order. | Economy.kif 1808-1808 | Nickel ore is an industry product type of nickel ore mining |
| No TPTP formula. May not be expressible in strict first order. | Economy.kif 1803-1803 | Nickel ore mining is a subattribute of copper ore and nickel ore mining |
| appearance as argument number 2 |
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| No TPTP formula. May not be expressible in strict first order. | domainEnglishFormat.kif 40497-40497 | |
| No TPTP formula. May not be expressible in strict first order. | domainEnglishFormat.kif 40496-40496 | |
| No TPTP formula. May not be expressible in strict first order. | domainEnglishFormat.kif 40495-40495 |
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Sigma version 3.0 is open source software produced by Articulate Software and its partners