| http://www.w3.org/ns/prov#value | - The critical feature is that the material contains discernable amounts of molecules with the feature R-C0 2 X, where R is an alkyl group and X is any group or element. [0034] The term liquid fuel as used in this specification means a liquid that without further refining can be used direcdy, or in a blend, to provide energy. [0035] The term liquid fuel precursor as used in this specification me
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