(Research effort) may undergo concentration.Logical formLearned from5 sentences. Concentration may undergo variations.Logical formLearned from5 sentences. Numbers may undergo concentration.Logical formLearned from5 sentences. A vote may undergo concentration.Logical formLearned from5 sentences. Concentration may undergo a failure.Logical formLearned from5 sentences. Stress may undergo concentrations.Logical formLearned from5 sentences. Concentration can be on detail.Logical formLearned from5 sentences. Sulphuric acid may undergo concentration.Logical formLearned from5 sentences. A (stimulant clenbuterol) may undergo concentration.Logical formLearned from5 sentences. A lab may find concentration of a (stimulant clenbuterol).Logical formLearned from5 sentences. Concentration can be a problem.Logical formLearned from5 sentences. Concentration of airborne pollutants may be intensified.Logical formLearned from5 sentences. Persons may find concentrations of oil.Logical formLearned from5 sentences. Concentration can be in waters.Logical formLearned from5 sentences. A level may pertain-to concentration.Logical formLearned from5 sentences.