(subclass LiquefiedPetroleumGas FossilFuel) | Mid-level-ontology.kif 1705-1705 | Liquefied petroleum gas is a subclass of fossil fuel |
(subclass LiquefiedPetroleumGas RefinedPetroleumProduct) | Economy.kif 5933-5933 | Liquefied petroleum gas is a subclass of refined petroleum product |