A coal may burn.Logical formLearned from24 sentences. A male may work in (coal mines).Logical formLearned from24 sentences. A coal can be smokeless.Logical formLearned from24 sentences. (Coal deposits) can be brown.Logical formLearned from24 sentences. A coal can be advanced.Logical formLearned from24 sentences. Use can be in underground (coal mines).Logical formLearned from24 sentences. A role can be for clean coal.Logical formLearned from24 sentences. A price of coal may rise.Logical formLearned from24 sentences. (Coal plants) can be in a country.Logical formLearned from24 sentences. Coals may pertain-to a fire.Logical formLearned from24 sentences. Coal can be abundant.Logical formLearned from24 sentences. A price may pertain-to a coal.Logical formLearned from24 sentences. A (coal industry) may pertain-to a state.Logical formLearned from24 sentences. The future may pertain-to a (coal industry).Logical formLearned from24 sentences. A (death toll) can be in a (coal mine explosion).Logical formLearned from24 sentences.