Some miners may work in a (coal mine).Logical formLearned from13 sentences. A (coal reserve) may pertain-to a country.Logical formLearned from13 sentences. Coal may be needed.Logical formLearned from13 sentences. A percent may pertain-to a (coal output).Logical formLearned from13 sentences. Coal may remain a fuel.Logical formLearned from13 sentences. A percent may pertain-to (coal mines).Logical formLearned from13 sentences. A (coal mine explosion) may kill some miners.Logical formLearned from13 sentences. (Coal producers) can be in a country.Logical formLearned from13 sentences. A country can be rich in coal.Logical formLearned from13 sentences. A country can be (coal consumer).Logical formLearned from13 sentences. A (coal market) can be international.Logical formLearned from13 sentences. (Coal mines) may undergo construction.Logical formLearned from13 sentences. (Coal cars) can be loaded.Logical formLearned from13 sentences. A (coal industry) may undergo a demise.Logical formLearned from13 sentences. Gas may be made from coal.Logical formLearned from13 sentences.