E may undergo concentration.Logical formLearned from12 sentences. Vapor may undergo concentrations.Logical formLearned from12 sentences. (Concentration camps) can be on soil.Logical formLearned from12 sentences. Teaching may undergo concentration.Logical formLearned from12 sentences. Concentrations can be in an area.Logical formLearned from12 sentences. Students may pursue concentrations.Logical formLearned from12 sentences. An estimate may pertain-to concentration.Logical formLearned from12 sentences. Stains of a color may be attributed to (iron concentrations).Logical formLearned from12 sentences. Stocks may undergo concentration.Logical formLearned from12 sentences. (Anthrax spores) may undergo concentrations.Logical formLearned from12 sentences. Homeless persons may undergo concentrations.Logical formLearned from12 sentences. Concentration can be unacceptable.Logical formLearned from12 sentences. Concentrations can be small.Logical formLearned from12 sentences. Veterans may undergo concentrations.Logical formLearned from12 sentences. Concentration can be large-scale.Logical formLearned from12 sentences.