An explosion may rock a (coal mine).Logical formLearned from14 sentences. A (coal train) can be empty.Logical formLearned from14 sentences. Developments can be at a (coal mine).Logical formLearned from14 sentences. A (coal mine) can be strikebound.Logical formLearned from14 sentences. (Coal production) may increase.Logical formLearned from14 sentences. Thousands of (coal miners) may go on strike.Logical formLearned from14 sentences. A (coal miner) may pertain-to the world.Logical formLearned from14 sentences. (Coal mines) can be dangerous.Logical formLearned from14 sentences. Coal may remain an (energy source).Logical formLearned from14 sentences. (Coal mines) can be disused.Logical formLearned from14 sentences. A (gas leak) can be in a (coal mine).Logical formLearned from14 sentences. A blast may rip through a (coal mine).Logical formLearned from14 sentences. An increase can be in (coal prices).Logical formLearned from14 sentences. A (death toll) can be from a (coal mine gas leak).Logical formLearned from13 sentences. (Coal mine safety) may undergo an administration.Logical formLearned from13 sentences.