Piles can be constituted-of-or-filled-with coal.Logical formLearned from26 sentences. (Surface mining) can be constituted-of-or-filled-with coal.Logical formLearned from26 sentences. (Coal resources) may pertain-to persons.Logical formLearned from26 sentences. Connection can be with a (surface coal mine).Logical formLearned from26 sentences. Use can be in (coal mines).Logical formLearned from26 sentences. (Coal mines) may undergo a development.Logical formLearned from26 sentences. A vein can be constituted-of-or-filled-with coal.Logical formLearned from26 sentences. A canary can be in a (coal mine).Logical formLearned from26 sentences. (Coal mine explosion) can be in a country.Logical formLearned from26 sentences. A tonne can be constituted-of-or-filled-with coal.Logical formLearned from26 sentences. A total can be constituted-of-or-filled-with some (coal miners).Logical formLearned from26 sentences. Some miners can be in a (coal mine).Logical formLearned from25 sentences. (Coal mine accidents) can be fatal.Logical formLearned from25 sentences. A coal can be crude.Logical formLearned from25 sentences. A family can be constituted-of-or-filled-with (coal miners).Logical formLearned from25 sentences.