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Term 1: Term 2:

(subclass Fuel Substance) Mid-level-ontology.kif 2099-2099 Fuel is a subclass of substance
(subclass FossilFuel Fuel) Mid-level-ontology.kif 2093-2093 Fossil fuel is a subclass of fuel
(subclass Charcoal Fuel) Cars.kif 1666-1666 Charcoal is a subclass of fuel

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