A virus may undergo concentrations.Logical formLearned from28 sentences. Concentrations can be in (ground water).Logical formLearned from28 sentences. A parts may undergo concentration.Logical formLearned from28 sentences. A product may undergo concentration.Logical formLearned from28 sentences. Concentration can be rapt.Logical formLearned from28 sentences. A virus may undergo concentration.Logical formLearned from28 sentences. Virus may undergo concentrations.Logical formLearned from28 sentences. (Air pollutants) may undergo concentration.Logical formLearned from28 sentences. Concentrations may pertain-to a person.Logical formLearned from28 sentences. Concentration can be in writing.Logical formLearned from28 sentences. Concentration can be in a region.Logical formLearned from28 sentences. Concentration can be explosive.Logical formLearned from28 sentences. A series can be constituted-of-or-filled-with (concentration camps).Logical formLearned from28 sentences. Structures may undergo concentration.Logical formLearned from28 sentences. An increase can be in concentrations.Logical formLearned from28 sentences.