(Tide concentrations) can be red.Logical formLearned from7 sentences. (Smoke concentrations) can be black.Logical formLearned from7 sentences. Eyes may narrow in concentration.Logical formLearned from7 sentences. Concentration may be focussed.Logical formLearned from7 sentences. Phytonutrients may undergo concentration.Logical formLearned from7 sentences. Concentration can be on some individual.Logical formLearned from7 sentences. Concentrations can be in an urine.Logical formLearned from7 sentences. A male may give a deal of concentration to work.Logical formLearned from7 sentences. Vitamin may undergo concentration.Logical formLearned from7 sentences. Progesterone may undergo concentration.Logical formLearned from7 sentences. A community may undergo concentration.Logical formLearned from7 sentences. Concentrations of some drugs can be minute.Logical formLearned from7 sentences. (Concentration dependant facts) can be about (prescription drug).Logical formLearned from7 sentences. Civilians can be in (concentration camps).Logical formLearned from7 sentences. Centenarians may undergo concentration.Logical formLearned from7 sentences.