A portion may pertain-to a coal.Logical formLearned from16 sentences. Adverse effects can be constituted-of-or-filled-with (coal mining practices).Logical formLearned from16 sentences. Part may pertain-to a coal.Logical formLearned from16 sentences. Coal can be for use.Logical formLearned from16 sentences. (Body click thumbnail) can be for (picture coal tit).Logical formLearned from16 sentences. One-third may pertain-to a coal.Logical formLearned from16 sentences. A heart may pertain-to an (anthracite coal region).Logical formLearned from16 sentences. Coal can be for (power plants).Logical formLearned from16 sentences. A (coal seam gas) can be with an (origin energy).Logical formLearned from16 sentences. A (power plant) may be fired by (waste coal).Logical formLearned from16 sentences. Plants may use coal.Logical formLearned from16 sentences. Coal can be an option.Logical formLearned from16 sentences. A trade can be in coal.Logical formLearned from16 sentences. A person can be (coal miner).Logical formLearned from16 sentences. Coal may make a comeback.Logical formLearned from16 sentences.