A (coal port) may pertain-to the world.Logical formLearned from19 sentences. A site may pertain-to a (coal mine).Logical formLearned from19 sentences. Some men may be trapped in a (coal mine).Logical formLearned from19 sentences. A (coal mining region) may pertain-to a country.Logical formLearned from19 sentences. A (coal producer) can be in a country.Logical formLearned from18 sentences. (Coal producers) may pertain-to a country.Logical formLearned from18 sentences. A country may have some (coal mines).Logical formLearned from18 sentences. A (coal mine flooding) may pertain-to a country.Logical formLearned from18 sentences. A (coal mine) may undergo a closure.Logical formLearned from18 sentences. A person may work in (coal mines).Logical formLearned from18 sentences. (Coal miners) may go on strike.Logical formLearned from18 sentences. Coal may undergo a disposal.Logical formLearned from18 sentences. (Coal mining) can be important.Logical formLearned from18 sentences. Fuel can be from coal.Logical formLearned from18 sentences. A bed can be constituted-of-or-filled-with coal.Logical formLearned from18 sentences.