| No TPTP formula. May not be expressible in strict first order. | Mid-level-ontology.kif 17826-17826 | 直升机 是 飞机 的 subclass |
| No TPTP formula. May not be expressible in strict first order. | MilitaryDevices.kif 1767-1767 | C h53 e 是 直升机 的 subclass |
| No TPTP formula. May not be expressible in strict first order. | MilitaryDevices.kif 1828-1828 | C h46 d 是 直升机 的 subclass |
| No TPTP formula. May not be expressible in strict first order. | MilitaryDevices.kif 1889-1889 | A h1 是 直升机 的 subclass |
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