A person may lose a bit of concentration.Logical formLearned from7 sentences. Concentration may increase with depth.Logical formLearned from7 sentences. (Oil reserve) may undergo concentration.Logical formLearned from7 sentences. A female may be took to a (concentration camp).Logical formLearned from7 sentences. Children may improve concentration.Logical formLearned from7 sentences. A (concentration camp) may pertain-to children.Logical formLearned from7 sentences. (Concentration camps) can be cruel.Logical formLearned from7 sentences. (Concentration camps) can be during a war.Logical formLearned from7 sentences. Dead trees may undergo concentration.Logical formLearned from7 sentences. A person may want concentration.Logical formLearned from7 sentences. Photographs may show some nazi (concentration camps).Logical formLearned from7 sentences. A trip can be to a nazi (concentration camp).Logical formLearned from7 sentences. (Coal gas) may undergo concentrations.Logical formLearned from7 sentences. Explosions may be caused by an ignition of concentrations of (coal gas).Logical formLearned from7 sentences. An athlete may have concentration of a drug.Logical formLearned from7 sentences.