A break can be in concentration.Logical formLearned from6 sentences. Radicals may undergo concentrations.Logical formLearned from6 sentences. Concentrations of limestone can be rivers.Logical formLearned from6 sentences. A (concentration time) may pertain-to a person.Logical formLearned from6 sentences. Revenue may undergo concentration.Logical formLearned from6 sentences. A state may have concentration of persons.Logical formLearned from6 sentences. Smog may undergo concentration.Logical formLearned from6 sentences. Mussels may undergo concentrations.Logical formLearned from6 sentences. Nazi experiments can be on (concentration camp inmates).Logical formLearned from6 sentences. Concentration may pertain-to an industry.Logical formLearned from6 sentences. Flavonoids may undergo concentration.Logical formLearned from6 sentences. Spending may undergo concentration.Logical formLearned from6 sentences. Lyrics may undergo concentration.Logical formLearned from6 sentences. A trip can be to a (concentration camp).Logical formLearned from6 sentences. A merger may result in concentration.Logical formLearned from6 sentences.