| No TPTP formula. May not be expressible in strict first order. | Mid-level-ontology.kif 2519-2519 | 过滤 是 设备 的 subclass |
| No TPTP formula. May not be expressible in strict first order. | MilitaryDevices.kif 1363-1363 | 绝对过滤器 是 过滤 的 subclass |
| No TPTP formula. May not be expressible in strict first order. | Cars.kif 917-917 | FuelFilter 是 过滤 的 subclass |
| No TPTP formula. May not be expressible in strict first order. | Cars.kif 938-938 | AirFilter 是 过滤 的 subclass |
| No TPTP formula. May not be expressible in strict first order. | Cars.kif 1683-1683 | CharcoalFilter 是 过滤 的 subclass |
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