(Coal seams) can be underground.Logical formLearned from37 sentences. A coal may be extracted.Logical formLearned from37 sentences. (Coal mining) can be in a us-state.Logical formLearned from37 sentences. A (death toll) can be from a (coal mine gas explosion).Logical formLearned from37 sentences. Coal may undergo an exploitation.Logical formLearned from36 sentences. (Coal prices) can be high.Logical formLearned from36 sentences. A coal can be solid.Logical formLearned from36 sentences. Hundreds can be constituted-of-or-filled-with (coal miners).Logical formLearned from36 sentences. A person may blaze coals.Logical formLearned from36 sentences. A producer can be constituted-of-or-filled-with coal.Logical formLearned from36 sentences. (Coal mines) can be in a us-state.Logical formLearned from36 sentences. A coal may be removed.Logical formLearned from36 sentences. Persons may burn coal.Logical formLearned from36 sentences. (Coal mines) may pertain-to persons.Logical formLearned from36 sentences. (Coal reserve) can be rich.Logical formLearned from35 sentences.