| No TPTP formula. May not be expressible in strict first order. | Mid-level-ontology.kif 5100-5100 | Mask 是 服装 的 subclass |
| No TPTP formula. May not be expressible in strict first order. | Mid-level-ontology.kif 5101-5101 | Mask 是 对于 面对 的 covering 的 subclass |
| No TPTP formula. May not be expressible in strict first order. | Cars.kif 3528-3528 | 呼吸器 是 Mask 的 subclass |
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