Coal may undergo a gasification.Logical formLearned from49 sentences. A (coal mining disaster) may pertain-to a country.Logical formLearned from48 sentences. Coal may be found.Logical formLearned from48 sentences. A value may pertain-to a coal.Logical formLearned from48 sentences. Pillars can be constituted-of-or-filled-with coal.Logical formLearned from48 sentences. An union may pertain-to (coal miners).Logical formLearned from48 sentences. Some percent can be constituted-of-or-filled-with coal.Logical formLearned from47 sentences. A (coal company) may pertain-to the world.Logical formLearned from47 sentences. Interest can be in coal.Logical formLearned from47 sentences. A coal can be hard.Logical formLearned from47 sentences. (Coal producers) may pertain-to the world.Logical formLearned from47 sentences. A (methane gas explosion) may rip through a (coal mine).Logical formLearned from46 sentences. Persons may have coal.Logical formLearned from46 sentences. A blast can be at a (coal mine).Logical formLearned from46 sentences. A (coal mine disaster) may pertain-to a country.Logical formLearned from46 sentences.