| http://www.w3.org/ns/prov#value | - The fuel for the combustion step may be any fuel that can be combusted with oxygen, including, but not limited to, coal, coke, wood, biomass, solid wastes, oils and other natural and synthetic liquid fuels of all grades and types, and hydrocarbon-containing gas of any type, such as natural gas, landfill gas, coal mine gas, gasifier syngas, or the like.
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