| No TPTP formula. May not be expressible in strict first order. | Languages.kif 14705-14709 |
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| No TPTP formula. May not be expressible in strict first order. | Merge.kif 1446-1446 | Human language is a subclass of language |
| No TPTP formula. May not be expressible in strict first order. | Merge.kif 1460-1460 | Constructed language is a subclass of human language |
| No TPTP formula. May not be expressible in strict first order. | Merge.kif 1477-1477 | Natural language is a subclass of human language |
| No TPTP formula. May not be expressible in strict first order. | Merge.kif 1485-1485 | Manual human language is a subclass of human language |
| No TPTP formula. May not be expressible in strict first order. | Merge.kif 1491-1491 | Spoken human language is a subclass of human language |
| No TPTP formula. May not be expressible in strict first order. | Merge.kif 1508-1508 | Written human language is a subclass of human language |
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