Concentration can be steely.Logical formLearned from16 sentences. Viruses may undergo concentrations.Logical formLearned from16 sentences. Concentration may waver.Logical formLearned from16 sentences. Receptors may undergo concentrations.Logical formLearned from16 sentences. (College students) may undergo concentration.Logical formLearned from16 sentences. Experiments can be on (concentration camp prisoners).Logical formLearned from16 sentences. Concentrations can be unsafe.Logical formLearned from16 sentences. Some years can be in (concentration camps).Logical formLearned from16 sentences. Camp may undergo concentration.Logical formLearned from16 sentences. Groups may undergo concentrations.Logical formLearned from16 sentences. Concentration may pertain-to an area.Logical formLearned from16 sentences. Concentrations can be solvent.Logical formLearned from16 sentences. Concentration can be in a continent.Logical formLearned from16 sentences. Specialists may undergo concentration.Logical formLearned from16 sentences. Asbestos may undergo concentration.Logical formLearned from16 sentences.