| http://www.w3.org/ns/prov#value | - The fuel may be any type of fuel which burns in the presence of oxygen, such as natural gas, gasoline, propane, #2 diesel, #6 heavy diesel, hydrogen, bio-diesel, vegetable oil, pulverized coal, liquefied coal slurry, and any other combustible material known in the art to be suitable for use in connection with combustion apparatus.
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