A complex may undergo concentration.Logical formLearned from16 sentences. A face may be screw_uped in concentration.Logical formLearned from16 sentences. Concentration may improve.Logical formLearned from16 sentences. A percent may undergo concentration.Logical formLearned from16 sentences. Concentration can be in the atmosphere.Logical formLearned from16 sentences. Eyes may narrow in concentration.Logical formLearned from16 sentences. Concentrations can be effective.Logical formLearned from16 sentences. A break can be in concentration.Logical formLearned from16 sentences. Concentration can be on social structures.Logical formLearned from16 sentences. Concentrations can be in the atmosphere.Logical formLearned from16 sentences. Concentration can be in a continent.Logical formLearned from16 sentences. Concentration can be a key.Logical formLearned from16 sentences. Concentrations can be illegal.Logical formLearned from16 sentences. Headquarters may undergo concentration.Logical formLearned from16 sentences. A need can be for (concentration camps).Logical formLearned from16 sentences.