| appearance as argument number 1 |
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| No TPTP formula. May not be expressible in strict first order. | Economy.kif 1768-1768 | Lead ore is an industry product type of lead ore mining |
| 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. | Economy.kif 1767-1767 | Lead ore mining is a subattribute of lead ore and zinc ore mining |
| appearance as argument number 2 |
|
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| No TPTP formula. May not be expressible in strict first order. | domainEnglishFormat.kif 33647-33647 | |
| No TPTP formula. May not be expressible in strict first order. | domainEnglishFormat.kif 33646-33646 | |
| No TPTP formula. May not be expressible in strict first order. | domainEnglishFormat.kif 33645-33645 |
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Sigma version 3.0 is open source software produced by Articulate Software and its partners