| appearance as argument number 1 |
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| No TPTP formula. May not be expressible in strict first order. | Economy.kif 1762-1762 | Lead industry is an instance of industry attribute |
| appearance as argument number 2 |
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| No TPTP formula. May not be expressible in strict first order. | Economy.kif 1764-1764 | Lead manufacturing is a subattribute of lead industry |
| No TPTP formula. May not be expressible in strict first order. | Economy.kif 1763-1763 | Lead ore mining is a subattribute of lead industry |
| No TPTP formula. May not be expressible in strict first order. | domainEnglishFormat.kif 33617-33617 | |
| No TPTP formula. May not be expressible in strict first order. | domainEnglishFormat.kif 33616-33616 | |
| No TPTP formula. May not be expressible in strict first order. | domainEnglishFormat.kif 33615-33615 |
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Sigma version 3.0 is open source software produced by Articulate Software and its partners