| appearance as argument number 1 |
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| No TPTP formula. May not be expressible in strict first order. | Mid-level-ontology.kif 8306-8306 | Unskilled occupation is disjoint from skilled occupation |
| No TPTP formula. May not be expressible in strict first order. | Mid-level-ontology.kif 8307-8308 | |
| No TPTP formula. May not be expressible in strict first order. | Mid-level-ontology.kif 8305-8305 | Unskilled occupation is a subclass of manual labor |
| appearance as argument number 2 |
|
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| No TPTP formula. May not be expressible in strict first order. | Mid-level-ontology.kif 20668-20668 | Janitor is a subclass of unskilled occupation |
| No TPTP formula. May not be expressible in strict first order. | domainEnglishFormat.kif 60556-60556 | |
| No TPTP formula. May not be expressible in strict first order. | domainEnglishFormat.kif 60555-60555 | |
| No TPTP formula. May not be expressible in strict first order. | domainEnglishFormat.kif 60554-60554 |
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Sigma version 3.0 is open source software produced by Articulate Software and its partners