| (subclass EngineCycle Motion) | Cars.kif 80-80 | Engine cycle is a subclass of motion |
| (subclass FourStrokeEngineCycle EngineCycle) | Cars.kif 134-134 | Four stroke engine cycle is a subclass of engine cycle |
| (subclass TwoStrokeEngineCycle EngineCycle) | Cars.kif 251-251 | Two stroke engine cycle is a subclass of engine cycle |
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