| No TPTP formula. May not be expressible in strict first order. | Cars.kif 4548-4548 | 子類 TwoCylinderEngine and IntermittentCombustionEngine |
| No TPTP formula. May not be expressible in strict first order. | Cars.kif 4586-4586 | 子類 HarleyDavidsonKnuckleheadEngine and TwoCylinderEngine |
| No TPTP formula. May not be expressible in strict first order. | Cars.kif 4690-4690 | 子類 HarleyDavidsonPanheadEngine and TwoCylinderEngine |
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