(Oil refineries) may undergo concentrations.Logical formLearned from6 sentences. A face may be furrowed in concentration.Logical formLearned from6 sentences. (Ozone concentrations) can be daily.Logical formLearned from6 sentences. Substrates may undergo concentration.Logical formLearned from6 sentences. A tongue can be in concentration.Logical formLearned from6 sentences. An (ozone concentration) can be daily.Logical formLearned from6 sentences. (Blood concentrations) can be increased.Logical formLearned from6 sentences. Explosions may undergo concentration.Logical formLearned from6 sentences. A measure can be for concentration.Logical formLearned from6 sentences. Arsenite may undergo concentrations.Logical formLearned from6 sentences. Safe places can be (concentration camps).Logical formLearned from6 sentences. Effects can be due to concentration of proteins.Logical formLearned from6 sentences. Concentration of fast-food restaurants may place communities.Logical formLearned from6 sentences. A (history major) can be with concentration.Logical formLearned from6 sentences. A person may visit a (concentration camp).Logical formLearned from6 sentences.