A (coal mine) can be inactive.Logical formLearned from18 sentences. Clouds can be constituted-of-or-filled-with (coal dust).Logical formLearned from18 sentences. (Coal miners) may be trapped.Logical formLearned from18 sentences. A coal can be of quality.Logical formLearned from18 sentences. A (coal company) may pertain-to a nation.Logical formLearned from18 sentences. A (coal contract) can be long-term.Logical formLearned from18 sentences. A (coal mine) may pertain-to the world.Logical formLearned from18 sentences. (Coal gas) may undergo a use.Logical formLearned from18 sentences. A coal can be owned.Logical formLearned from18 sentences. A plant may burn coal.Logical formLearned from18 sentences. Emissions can be from coal.Logical formLearned from18 sentences. A (coal mine) may be located.Logical formLearned from18 sentences. A male may shovel coal.Logical formLearned from18 sentences. A mine may produce coal.Logical formLearned from18 sentences. Coal can be for (energy needs).Logical formLearned from18 sentences.