coal, briquettes, black, swarthy, jetblack, deep black, energy, power,

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Keywords: black, braunkohlebrikett, brennstoffe, briquettes, coal, combustibles, deep, electric, electricity, energiedichte, energy, festbrennstoffe, feste, fossile, ganzstein, jetblack, kohlebrikett, kohlebriketts, power, rock, schieferstein, sediment, sedimentgestein, slate, swarthy