A cost may pertain-to a coal.Logical formLearned from19 sentences. Coal may be sold.Logical formLearned from19 sentences. A (coal industry) can be troubled.Logical formLearned from19 sentences. A mine may produce an average of some tons of coal.Logical formLearned from19 sentences. A coal can be indigenous.Logical formLearned from19 sentences. A support can be for coal.Logical formLearned from19 sentences. An owner may pertain-to a coal.Logical formLearned from19 sentences. Coal may be powered.Logical formLearned from19 sentences. Coal can be to liquids.Logical formLearned from19 sentences. (Coal plants) can be in a country.Logical formLearned from19 sentences. A reliance can be on (coal power).Logical formLearned from19 sentences. A coal can be burnt.Logical formLearned from19 sentences. (Coal plants) may pertain-to persons.Logical formLearned from19 sentences. A son may pertain-to a (coal miner).Logical formLearned from19 sentences. (Coal mines) may close.Logical formLearned from19 sentences.