Variety can be constituted-of-or-filled-with coals.Logical formLearned from11 sentences. Methane can be from (coal mines).Logical formLearned from11 sentences. Samples can be constituted-of-or-filled-with coal.Logical formLearned from11 sentences. Emissions can be from (coal mines).Logical formLearned from11 sentences. (Coal mining) can be dangerous.Logical formLearned from11 sentences. (Coal contracts) can be long-term.Logical formLearned from11 sentences. An investigation can be into a cause of a (coal mine disaster).Logical formLearned from11 sentences. A cause may pertain-to a (coal mine disaster).Logical formLearned from11 sentences. A history may pertain-to a (coal industry).Logical formLearned from11 sentences. A mine can be on a (coal seam).Logical formLearned from11 sentences. A coal can be useful.Logical formLearned from11 sentences. Persons may run a (coal mine).Logical formLearned from11 sentences. Stores can be constituted-of-or-filled-with coal.Logical formLearned from11 sentences. A (coal consumption) can be voracious.Logical formLearned from11 sentences. A country may become a (coal importer).Logical formLearned from11 sentences.