Alternatives can be to coal.Logical formLearned from31 sentences. Canaries can be in a (coal mine).Logical formLearned from31 sentences. (Coal companies) may pertain-to a country.Logical formLearned from31 sentences. A (coal company) may pertain-to a us-state.Logical formLearned from31 sentences. A male may put (coal profits).Logical formLearned from31 sentences. A (methane blast) may rip through a (coal mine).Logical formLearned from31 sentences. A (death toll) can be from a (coal mine blast).Logical formLearned from31 sentences. A dependency can be on coal.Logical formLearned from31 sentences. A (coal mine) may be located.Logical formLearned from30 sentences. A mine may produce some tons of coal.Logical formLearned from30 sentences. A coal can be in a country.Logical formLearned from30 sentences. Coal may undergo uses.Logical formLearned from30 sentences. (Boom times) can be in (coal country).Logical formLearned from30 sentences. A (coal production) can be increased.Logical formLearned from30 sentences. (Coal mine sites) can be abandoned.Logical formLearned from30 sentences.