| (subclass Fuel Substance) | Mid-level-ontology.kif 1693-1693 | Fuel は 物質 の subclass では %n |
| (subclass FossilFuel Fuel) | Mid-level-ontology.kif 1687-1687 | FossilFuel は Fuel の subclass では %n |
| (subclass Charcoal Fuel) | Cars.kif 1670-1670 | Charcoal は Fuel の subclass では %n |
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