Some persons may be buried in (gold pits).Logical formLearned from5 sentences. A (coal mine pit) can be flooded.Logical formLearned from4 sentences. Some pits can be at a site.Logical formLearned from4 sentences. A (coal pit) may be owned by a company.Logical formLearned from4 sentences. A (pit trading) may pertain-to gold.Logical formLearned from4 sentences. Some workers may be evacuated from pits.Logical formLearned from4 sentences. (Methane pits) may undergo a use.Logical formLearned from4 sentences. A (coal pit) can be illegal.Logical formLearned from4 sentences. Pit may trap some miners.Logical formLearned from4 sentences. A total of some cubic meters of water may flood a pit.Logical formLearned from4 sentences. A (gas explosion) may happen at (coal pits).Logical formLearned from4 sentences. A male may limp from a pit.Logical formLearned from4 sentences. Some (coal pits) can be in a city.Logical formLearned from4 sentences. Floods may be caused by a (copper mine waste pit).Logical formLearned from4 sentences. Some (spiral series) can be constituted-of-or-filled-with pits.Logical formLearned from4 sentences.