Concentration can be in a district.Logical formLearned from7 sentences. Names may undergo concentration.Logical formLearned from7 sentences. Couples may undergo concentration.Logical formLearned from7 sentences. Some persons may have concentration of (energy companies).Logical formLearned from7 sentences. Hydrocarbons may undergo concentrations.Logical formLearned from7 sentences. Concentration can be a challenge.Logical formLearned from7 sentences. Cultural institutions may undergo concentration.Logical formLearned from7 sentences. Concentrations may develop.Logical formLearned from7 sentences. Loss may undergo concentration.Logical formLearned from7 sentences. Concentrations may settle in places.Logical formLearned from7 sentences. Concentrations can be across states of residents of origin.Logical formLearned from7 sentences. A death can be in a (concentration camp).Logical formLearned from7 sentences. Might may undergo concentration.Logical formLearned from7 sentences. Limestone may undergo concentrations.Logical formLearned from7 sentences. Concentration can be rapt.Logical formLearned from7 sentences.