A country can be (coal producer).Logical formLearned from59 sentences. (Coal miners) can be retired.Logical formLearned from57 sentences. Canaries can be in a (coal mine).Logical formLearned from57 sentences. Some workers may be trapped in a (coal mine).Logical formLearned from57 sentences. Coal can be cheap.Logical formLearned from56 sentences. A strike may pertain-to (coal miners).Logical formLearned from56 sentences. (Coal miner) may rise some percent to some rupiah.Logical formLearned from56 sentences. A (coal mine) may pertain-to a river.Logical formLearned from55 sentences. A coal can be high.Logical formLearned from55 sentences. Electricity can be from coal.Logical formLearned from55 sentences. (Surface coal mining) may undergo a regulation.Logical formLearned from55 sentences. (Coal mine operators) can be underground.Logical formLearned from55 sentences. Coal can be a fuel.Logical formLearned from55 sentences. (Coal reserve) may pertain-to a country.Logical formLearned from54 sentences. (Coal plants) can be dirty.Logical formLearned from54 sentences.