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anthracite, background, biomass, black, calorific, carbon, coal, combustion, cost, dark, dirty, effect, energy, environment, extract, fossil, fossil fuels, fuel, heaps, heat, heater, hot, industrial, industry, large quantity of, lignite, lump, lumps, material, metallurgical, mine, mining, natural, natural material, natural stone, piece, power, prices, quarry stone, resources, shine, solid, station, stone, stone lumps, storage, texture, types, unclean, winter,